NOCE (National Opticianry Competency Exam) — Questions and Answers

Question 1: When a contact lens prescription expires and the patient requests a supply to last until their next appointment, what should the optician do?

Dispense one box and document it as an emergency supply
Dispense up to a 3-month supply as a professional courtesy
Refuse to dispense and direct the patient to obtain a current prescription (Correct answer)
Call the prescriber and verbally confirm the old prescription is still valid

Correct answer: Refuse to dispense and direct the patient to obtain a current prescription

Dispensing contact lenses on an expired prescription is prohibited under federal law; the optician must direct the patient to obtain a valid, current prescription.

Question 2: Which lensometer reading sequence is the correct method for measuring a lens in minus cylinder form?

Read sphere first at the clearest line target, then rotate to clear the dot target for add power
Adjust power wheel to most minus setting then advance toward plus until target is clear
Focus the line target for the most plus power, record as sphere; rotate axis to focus lines for least plus power, record cylinder as the difference (Correct answer)
Focus dots first for prism, then lines for sphere, then rotate for cylinder

Correct answer: Focus the line target for the most plus power, record as sphere; rotate axis to focus lines for least plus power, record cylinder as the difference

In minus cylinder form, start with the most plus (least minus) power meridian for the sphere, then rotate 90° to the other meridian; the difference between the two readings is the cylinder.

Question 3: What does the term 'base curve' refer to on an ophthalmic frame?

The width of the bridge
The angle of the pantoscopic tilt
The curvature of the front frame along the horizontal plane (Correct answer)
The distance from the front plane to the temple hinge

Correct answer: The curvature of the front frame along the horizontal plane

Base curve on a frame refers to the curvature of the front eyewire, measured in diopters, which determines how wrap-around the frame appears.

Question 4: What does the refractive index of a lens material determine?

The Abbe value of the lens
The lens's resistance to impact
How much the lens bends light relative to its thickness (Correct answer)
The UV protection level of the material

Correct answer: How much the lens bends light relative to its thickness

The refractive index measures how much a material bends light; a higher index allows a thinner lens to achieve the same optical power.

Question 5: Which organization publishes the voluntary standards most commonly referenced for ophthalmic lens tolerances in the United States?

ANSI, often adopted by state boards (Correct answer)
FDA directly
American Optometric Association
ISO alone

Correct answer: ANSI, often adopted by state boards

The American National Standards Institute (ANSI) publishes the Z80 series of voluntary ophthalmic standards, which are widely adopted by state boards and the industry.

Question 6: When adjusting temples for a patient with asymmetrical ears, which measurement is most critical?

Frame PD
Vertex distance
Temple length to bend (Correct answer)
Bridge width

Correct answer: Temple length to bend

The temple length to bend must be individually set for each ear to ensure the frame sits level on an asymmetrical face.

Question 7: Monocular PD for bifocal segment centration should be measured with the patient:

Looking straight ahead at distance fixation (Correct answer)
Fixating a target 6 meters away with one eye covered
Looking at the dispenser's nose tip at arm's length
Looking down at their near reading material

Correct answer: Looking straight ahead at distance fixation

Distance monocular PD is measured with the patient looking at a distance target, ensuring proper optical center placement for the distance portion.

Question 8: You can change a lens' focal length by:

Coating the surface
Making the lens bigger
Making the lens smaller
Changing the curvature of one surface (Correct answer)

Correct answer: Changing the curvature of one surface

Curvature of one surface is altered. Because light waves are refracted at a greater angle with regard to the lens' optical axis, lenses with higher angles of curvature will have shorter focal lengths. The focal length of the lens shortens as the refractive index rises or gets more curved. The focal length won't change if the lens surface is coated, and increasing the diameter of the lens while maintaining the curvature of the surfaces has no effect on the angle of curvature or the way light waves are refracted.

Question 9: A patient develops a red, painful eye with a corneal infiltrate after sleeping in monthly replacement soft contact lenses. What is the most likely diagnosis?

Microbial keratitis (Correct answer)
Giant papillary conjunctivitis
Contact lens-induced acute red eye (CLARE)
Superficial punctate keratitis

Correct answer: Microbial keratitis

Microbial keratitis is a serious corneal infection associated with overnight contact lens wear and presents with pain, redness, and a corneal infiltrate.

Question 10: Which of the following best describes the purpose of a lens clock (Geneva lens measure) in the opticianry workflow?

To verify finished prescription accuracy to ANSI standards
To determine the refractive index of an unknown lens material
To measure pupillary distance precisely
To estimate lens surface curvature and check lens form for remake decisions (Correct answer)

Correct answer: To estimate lens surface curvature and check lens form for remake decisions

A Geneva lens measure estimates surface curvature to help identify lens form and check whether a lens matches the intended base curve, useful in remake verification and lens identification.

Question 11: An optician is using a manual keratometer to measure the corneal curvature of a patient. The horizontal meridian reading is 44.50 D and the vertical meridian reading is 42.75 D. What does this finding indicate?

With-the-rule astigmatism
Against-the-rule astigmatism (Correct answer)
Oblique astigmatism
A spherical cornea

Correct answer: Against-the-rule astigmatism

Against-the-rule astigmatism is present when the horizontal meridian of the cornea is steeper (has a higher dioptric power) than the vertical meridian. In this case, the horizontal reading of 44.50 D is steeper than the vertical reading of 42.75 D.

Question 12: A patient requests a copy of their eyeglass prescription but the optometrist's office says they must pay an inflated fee before receiving it. Under FTC rules, this is:

Permissible if the fee covers administrative costs
Legal if the patient signed a waiver at intake
A violation — patients must receive prescriptions at no extra charge (Correct answer)
Acceptable only if the exam was covered by insurance

Correct answer: A violation — patients must receive prescriptions at no extra charge

Under the FTC Eyeglass Rule, prescribers must provide a copy of the prescription to the patient at no additional charge upon completion of the exam.

Question 13: Which ANSI standard specifically addresses requirements and test methods for non-prescription sunglasses?

ANSI Z87.1
ANSI Z80.1
ANSI Z80.5
ANSI Z80.3 (Correct answer)

Correct answer: ANSI Z80.3

ANSI Z80.3 covers requirements for non-prescription sunglasses and fashion eyewear, including UV transmittance and impact resistance.

Question 14: The critical angle in optics refers to the angle at which:

Dispersion is eliminated
Refraction is maximized
Light absorption is greatest
Total internal reflection occurs (Correct answer)

Correct answer: Total internal reflection occurs

The critical angle is the minimum angle of incidence at which total internal reflection occurs at the interface between a denser and less dense medium.

Question 15: Which measurement determines where to place the optical center of a single-vision lens vertically?

Monocular pupillary height (Correct answer)
Optical center height from the datum line
Seg height
Fitting height

Correct answer: Monocular pupillary height

Monocular pupillary height (measured from the lowest point of the frame to the pupil center) determines vertical optical center placement for single-vision lenses.

Question 16: When a patient presents with a contact lens prescription and requests new lenses, the optician must verify the prescription has not expired. In most US states, what is the standard expiration period for a contact lens prescription?

5 years
1 year (Correct answer)
2 years
6 months

Correct answer: 1 year

Under the US Fairness to Contact Lens Consumers Act (FCLCA), contact lens prescriptions are valid for a minimum of 1 year from the date of the fitting exam, unless the prescriber specifies a different expiration for clinical reasons.

Question 17: Which instrument is specifically used to measure the back vertex distance of a spectacle lens?

Distometer (Correct answer)
Focimeter
Pupillometer
Geneva lens measure

Correct answer: Distometer

A distometer (also called a vertex distance gauge) measures the distance from the back surface of the lens to the cornea.

Question 18: A patient with a high-minus prescription who is sensitive to peripheral color fringing would benefit most from a lens material with which of the following characteristics?

A low specific gravity and a low Abbe value
A high specific gravity and a high Abbe value
A high refractive index and a low Abbe value
A low refractive index and a high Abbe value (Correct answer)

Correct answer: A low refractive index and a high Abbe value

The Abbe value is a measure of a lens material's chromatic aberration. A higher Abbe value indicates less chromatic aberration, meaning less color fringing, which is crucial for patient comfort in higher prescriptions. While a high refractive index creates a thinner lens, it is often associated with a lower Abbe value (more chromatic aberration). Therefore, prioritizing a high Abbe value is most critical for this patient's specific complaint. A low refractive index material like CR-39 often has a high Abbe value (58).

Question 19: When a plastic frame is too tight at the temples, the correct adjustment involves:

Heating the frame and spreading the temples (Correct answer)
Bending the frame front downward
Filing the nose pads
Tightening the hinge screws

Correct answer: Heating the frame and spreading the temples

Plastic frames must be heated to their softening point before widening the temples to avoid cracking the material.

Question 20: A patient returns to the dispensary complaining that with their new glasses, straight lines and rectangular objects, like door frames, appear bowed or curved. The prescription and PDs have been verified as correct. Which of the following is the most likely cause of this specific distortion?

A significant change in base curve from the previous lenses (Correct answer)
Incorrect vertical optical center height
Incorrect pantoscopic tilt
Excessive face form or wrap

Correct answer: A significant change in base curve from the previous lenses

A significant change in the base curve of the lenses from what the patient was previously accustomed to can induce peripheral distortions. This can cause a 'barrel' distortion in minus lenses or 'pincushion' distortion in plus lenses, making straight lines appear curved. While other factors can cause adaptation issues, the perception of bowed lines is a classic symptom of base curve-induced distortion.

Question 21: According to the Federal Trade Commission's (FTC) Eyeglass Rule, a prescriber must provide the patient with a copy of their prescription under which of the following conditions?

Only after the patient has paid for the examination in full.
Immediately after the refraction is complete, regardless of whether the patient asks for it. (Correct answer)
After the patient signs a waiver releasing the prescriber from liability for glasses made elsewhere.
Only if the patient does not intend to purchase glasses from the prescriber.

Correct answer: Immediately after the refraction is complete, regardless of whether the patient asks for it.

The FTC Eyeglass Rule mandates the automatic release of a spectacle prescription to the patient immediately following the eye exam. This rule is designed to promote consumer choice by allowing patients to shop for eyewear wherever they choose. The release cannot be conditioned on payment (unless the practice requires immediate payment from all patients) or the purchase of eyewear from the prescriber, and liability waivers are prohibited.

Question 22: A construction worker requires prescription safety glasses. According to ANSI Z87.1 standards, which lens marking indicates the eyewear has been tested for high-impact resistance?

D3
Z87
Z87-2
Z87+ (Correct answer)

Correct answer: Z87+

The ANSI Z87.1 standard specifies markings for safety eyewear. The '+' sign indicates that the lens has passed a high-velocity impact test, which involves a 1/4-inch steel ball traveling at 150 feet per second. The 'Z87' mark alone signifies basic impact resistance. 'Z87-2' indicates a prescription safety frame. 'D3' indicates protection from liquid splashes and droplets.

Question 23: A patient who is a minor comes in for eyeglasses and needs to sign a consent form. Who is legally authorized to provide consent for the prescription and dispensing services?

The prescribing optometrist on behalf of the patient
Any adult accompanying the minor
A parent or legal guardian (Correct answer)
The minor patient, as they are the direct recipient of care

Correct answer: A parent or legal guardian

Minors generally lack legal capacity to consent to medical services; a parent or legal guardian must provide informed consent on their behalf.

Question 24: When using a lensometer to measure a bifocal add power, where should the bifocal segment be positioned in the instrument?

Above the distance optical center
Positioned so the segment line bisects the aperture
Centered in the aperture ring
The reading segment is placed in the aperture ring (Correct answer)

Correct answer: The reading segment is placed in the aperture ring

To measure add power, the reading (near) segment is placed in the lensometer aperture ring to read the near prescription.

Question 25: A patient returns with a frame that is riding low, causing the bifocal to be too high. The nose pads are at their lowest adjustment. The best next step is:

Remake the lenses with a lower segment
Order a frame with a deeper bridge (Correct answer)
Increase pantoscopic tilt to lower the frame front
Reduce face form angle

Correct answer: Order a frame with a deeper bridge

If nose pad adjustment is exhausted, selecting a frame with a smaller or deeper bridge saddle will raise the frame's resting position on the nose.

Question 26: For the prescription −2.00 −1.00 × 090, what is the power in the 180° meridian?

−1.00 D
−2.00 D
−3.00 D (Correct answer)
+1.00 D

Correct answer: −3.00 D

With cylinder axis at 090, maximum power acts at 180°: −2.00 + (−1.00) = −3.00 D.

Question 27: Transpose +2.00 −1.50 × 090 into plus cylinder form. What is the result?

−0.50 +1.50 × 180
+0.50 +1.50 × 090
+2.00 +1.50 × 180
+0.50 +1.50 × 180 (Correct answer)

Correct answer: +0.50 +1.50 × 180

New sphere = +2.00 + (−1.50) = +0.50; new cylinder = +1.50; new axis = 090 + 90 = 180.

Question 28: A patient with anisometropia of 2.50 D experiences vertical imbalance and diplopia when reading through their bifocal. To correct this, a slab-off is ordered. On which lens is a conventional slab-off typically ground?

The lens with the most minus or least plus power in the vertical meridian. (Correct answer)
The lens with the higher cylinder power.
The lens with the most plus power in the vertical meridian.
The lens with the lower base curve.

Correct answer: The lens with the most minus or least plus power in the vertical meridian.

A conventional slab-off is a bicentric grind that adds base-up prism to the reading area of one lens to counteract vertical imbalance. It is always applied to the lens that has the most minus or least plus power in the 90-degree (vertical) meridian. This effectively neutralizes the excessive base-down prism induced in that eye at the reading level.

Question 29: Which fitting measurement determines the height at which the progressive addition lens corridor should be placed?

Vertex distance
Monocular PD
Segment height (fitting height) (Correct answer)
Pantoscopic tilt angle

Correct answer: Segment height (fitting height)

The segment (fitting) height marks the position of the pupil center relative to the frame bottom to align the progressive corridor correctly.

Question 30: When neutralizing a lens with a lensometer, the power wheel is adjusted until the target mires are sharp and at the center. What does this indicate?

The prism is neutralized
The cylinder power has been measured
The sphere power has been measured (Correct answer)
The axis has been found

Correct answer: The sphere power has been measured

When the target is centered and clear with the power drum adjusted, the sphere power (or one principal meridian) of the lens has been neutralized.

Question 31: The Humphrey lensmeter (automated lensometer) expresses cylinder in which form by default?

Plus cylinder form only
Spherical equivalent only
Both plus and minus, selectable (Correct answer)
Minus cylinder form only

Correct answer: Both plus and minus, selectable

Most automated lensometers allow the user to select either plus or minus cylinder notation for the displayed prescription.

Question 32: During the final dispensing appointment, which of the following is the most crucial instruction for ensuring a new progressive lens wearer adapts successfully?

"Alternate wearing your new glasses with your old glasses for the first week."
"Point your nose and turn your head to look at objects, rather than just moving your eyes." (Correct answer)
"Be sure to clean your lenses daily with the provided microfiber cloth."
"If the frames feel loose, you can tighten the screws at the hinges yourself."

Correct answer: "Point your nose and turn your head to look at objects, rather than just moving your eyes."

The design of a progressive lens features a central corridor of clear vision with peripheral areas of aberration. The most effective way for a new wearer to achieve clear vision at all distances and avoid the distorted areas is to learn to point their nose directly at their object of interest, turning their head instead of just their eyes. This keeps their line of sight within the clear corridor. The other options are either general advice or counterproductive to adaptation.

Question 33: A pachymeter instrument is used to measure:

Axial length of the eye
Lens thickness of spectacle lenses
Corneal thickness (Correct answer)
Intraocular pressure

Correct answer: Corneal thickness

A pachymeter measures corneal thickness, which is important for contact lens fitting and monitoring corneal health.

Question 34: Spectacle magnification (SM) is the product of which two factors?

Abbe value and base curve
Index factor and thickness factor
Pantoscopic tilt and vertex distance
Power factor and shape factor (Correct answer)

Correct answer: Power factor and shape factor

SM = Power Factor × Shape Factor; power factor depends on back vertex power and vertex distance, shape factor on front curve and thickness.

Question 35: A dispensing optician verifies a finished lens using a lensometer. If the mires appear broken or distorted, this most likely indicates:

Incorrect axis
Incorrect sphere power
Scratched or defective lens surface (Correct answer)
Prism in the lens

Correct answer: Scratched or defective lens surface

Broken or distorted mires in the lensometer indicate surface irregularities such as scratches, warpage, or coating defects.

Question 36: Before neutralizing an unknown lens in a manual lensometer, what is the first and most critical step the operator must perform?

Focus the eyepiece for their own eye. (Correct answer)
Set the axis wheel to 90 degrees.
Turn the power drum until it reads -10.00 D.
Place the lens on the stage with the concave side up.

Correct answer: Focus the eyepiece for their own eye.

The first step before using a manual lensometer is to calibrate it for the user's own refractive error by focusing the eyepiece. The user should turn the eyepiece counter-clockwise until the reticle (the black target inside) is blurred, and then turn it clockwise until the reticle is in sharp, clear focus. Failure to do this will result in inaccurate power readings.

Question 37: A patient requires a prism of 4Δ base-in for the right eye. If split equally, how much prism is ground on each lens?

2Δ base-in on each lens (Correct answer)
4Δ base-in on each lens
1Δ base-in on each lens
2Δ base-out on each lens

Correct answer: 2Δ base-in on each lens

When prism is split equally, half the total prism (2Δ) is placed base-in on each lens.

Question 38: Under HIPAA, when an optical retail employee discusses a patient's prescription with an insurance company to process a claim, this disclosure is considered:

Legal only if the patient is physically present
Permitted as a treatment, payment, or health care operations activity (Correct answer)
Prohibited unless the insurer is listed as a covered entity
A HIPAA violation requiring patient authorization

Correct answer: Permitted as a treatment, payment, or health care operations activity

HIPAA permits disclosure of protected health information for treatment, payment, and health care operations (TPO) without requiring additional patient authorization.

Question 39: An optician is verifying a pair of prescription safety glasses intended for a factory worker. To meet the ANSI Z87.1 standard for high-impact resistance, which marking must be present on the lenses?

The manufacturer's logo.
A '+' symbol. (Correct answer)
The Z87-2 mark.
The letter 'S' for 'Safety'.

Correct answer: A '+' symbol.

The American National Standards Institute (ANSI) Z87.1 standard specifies markings for safety eyewear. While 'Z87' indicates the eyewear meets basic impact standards, the '+' symbol specifically signifies that the lens has passed the more rigorous high-velocity impact test. Prescription safety frames are marked 'Z87-2'. For high-impact prescription eyewear, both the frame and lens must have the appropriate markings (e.g., Z87-2+ on the frame and '+' on the lens).

Question 40: What is the typical overall diameter range for standard soft contact lenses?

13.8–14.5 mm (Correct answer)
8.0–9.0 mm
9.5–10.5 mm
16.0–17.0 mm

Correct answer: 13.8–14.5 mm

Most soft contact lenses have an overall diameter of 13.8–14.5 mm to ensure proper corneal coverage and limbal overlap.

Question 41: An aspheric lens design is most beneficial for a patient with a high hyperopic prescription primarily because it:

Allows for a greater range of tinting options.
Reduces lens thickness, weight, and peripheral distortions. (Correct answer)
Enhances chromatic aberration correction.
Increases the magnification effect for better reading.

Correct answer: Reduces lens thickness, weight, and peripheral distortions.

Aspheric lenses have a flatter curvature profile compared to traditional spherical lenses. This design minimizes the lens profile, making it thinner and lighter, which is especially noticeable in high plus (hyperopic) prescriptions. This change in curvature also significantly reduces spherical aberration, which causes distortion and a 'bulging' look at the lens periphery, thereby improving both aesthetics and visual quality.

Question 42: When using a PD ruler to measure monocular PDs, the examiner should close which of their own eyes to eliminate parallax error?

The left eye
The right eye
The eye opposite to the patient's eye being measured (Correct answer)
Either eye equally

Correct answer: The eye opposite to the patient's eye being measured

To eliminate parallax, the examiner closes the eye opposite to the patient's eye being measured, so their open eye is aligned over the measurement point.

Question 43: ANSI Z80.1 is the primary US standard governing tolerances for which type of ophthalmic product?

Prescription spectacle lenses (Correct answer)
Contact lenses
Sunglasses
Ophthalmic frames

Correct answer: Prescription spectacle lenses

ANSI Z80.1 establishes the tolerances and requirements for prescription ophthalmic lenses in the United States.

Question 44: Using Snell's law, if light strikes glass (n = 1.50) at 30° from the normal in air (n = 1.00), what is the approximate angle of refraction?

19.5° (Correct answer)
10°
30°
45°

Correct answer: 19.5°

n₁ sin θ₁ = n₂ sin θ₂ → sin θ₂ = sin 30° / 1.50 = 0.333, so θ₂ ≈ 19.5°.

Question 45: A lens has a focal length of -40 cm. What is its power in diopters?

+2.50 D
-2.50 D (Correct answer)
-0.025 D
+0.025 D

Correct answer: -2.50 D

The formula to find the dioptric power (D) of a lens from its focal length (f) is D = 1 / f (in meters). First, convert the focal length from centimeters to meters: -40 cm = -0.40 m. Then, apply the formula: D = 1 / -0.40 = -2.50 D. A negative focal length indicates a minus (concave) lens.

Question 46: Which contact lens wearing schedule requires the most stringent patient education regarding infection risk?

Extended wear (overnight) (Correct answer)
Monthly replacement daily wear
Daily disposable
Biweekly replacement daily wear

Correct answer: Extended wear (overnight)

Extended wear lenses significantly increase the risk of microbial keratitis due to reduced oxygen transmission and disrupted tear film during sleep.

Question 47: A patient is having difficulty with near vision. The process of accommodation, which allows the eye to focus on near objects, is primarily driven by the contraction of which intraocular muscle?

Ciliary muscle (Correct answer)
Iris sphincter
Superior rectus
Lateral rectus

Correct answer: Ciliary muscle

Accommodation is the process by which the eye increases its optical power to maintain a clear image of near objects. This is achieved through the contraction of the ciliary muscle, which relaxes the zonular fibers, allowing the crystalline lens to become more convex.

Question 48: A patient experiences swim and distortion when wearing new progressive lenses. Which adjustment is MOST likely to help?

Adjust pantoscopic tilt to match the prescribed value (Correct answer)
Replace lenses with a different brand
Increase vertex distance
Reduce the temple spread

Correct answer: Adjust pantoscopic tilt to match the prescribed value

Correcting pantoscopic tilt aligns the progressive lens zones to the patient's line of sight, reducing peripheral swim and distortion.

Question 49: A prismatic effect found at the optical center of a lens during lensometry most likely indicates:

Normal variation acceptable within ANSI tolerances
The lens is a high-plus design
Incorrectly prescribed cylinder
A manufacturing defect or incorrect prism in the prescription (Correct answer)

Correct answer: A manufacturing defect or incorrect prism in the prescription

Prism measured at the optical center of the lens indicates either intentional prescribed prism or a manufacturing error, since a properly made non-prism lens should have zero prism at its optical center.

Question 50: What is the primary purpose of an anti-reflective (AR) coating applied to ophthalmic lenses?

To reduce the overall weight of the lens
To increase the impact resistance of the lens material
To block ultraviolet radiation from reaching the eye
To reduce glare and surface reflections, improving visual clarity and cosmetic appearance (Correct answer)

Correct answer: To reduce glare and surface reflections, improving visual clarity and cosmetic appearance

AR coatings reduce light reflections off lens surfaces, which minimizes glare, improves light transmission, and gives lenses a more cosmetically appealing clear appearance.

Question 51: Which of the following best describes the legal significance of passing the ABO-NCLE examination?

It grants a federal license to practice opticianry in all 50 states
It certifies the optician as a licensed optometrist in non-licensing states
It is a nationally recognized credential that some states accept in lieu of or in addition to state licensure (Correct answer)
It replaces the need for any continuing education requirements

Correct answer: It is a nationally recognized credential that some states accept in lieu of or in addition to state licensure

ABO-NCLE certification is a nationally recognized professional credential; individual states determine whether it satisfies or supplements their licensure requirements.

Question 52: What does the Dk value of a contact lens material represent?

Oxygen permeability of the lens material (Correct answer)
Lens durability and scratch resistance
Water content percentage
Refractive index of the lens

Correct answer: Oxygen permeability of the lens material

Dk is a measure of oxygen permeability where D is the diffusion coefficient and k is the solubility of oxygen in the lens material.

Question 53: When measuring monocular PDs for progressive lens fitting, the measurement is taken from the center of which anatomical structure?

The inner canthus to the pupil center
The limbus edge to the frame center
The outer canthus to the pupil center
The nasal bridge midline to each pupil center (Correct answer)

Correct answer: The nasal bridge midline to each pupil center

Monocular PD is measured from the bridge midline (root of the nose) to the center of each pupil independently.

Question 54: Which of the following best describes the purpose of a state opticianry practice act?

To create certification exams administered by the state
To establish product quality standards for ophthalmic lenses
To regulate the pricing of eyeglasses within the state
To define the legal scope of practice, licensure requirements, and disciplinary procedures for opticians (Correct answer)

Correct answer: To define the legal scope of practice, licensure requirements, and disciplinary procedures for opticians

A state practice act defines who may legally practice opticianry, what acts are permitted, educational and examination requirements, and how violations are handled.

Question 55: A soft toric contact lens rotates 15 degrees counterclockwise on the eye. If the prescription calls for 180-degree cylinder axis, what axis should be ordered?

195 degrees
180 degrees
15 degrees
165 degrees (Correct answer)

Correct answer: 165 degrees

Using the LARS rule (Left Add, Right Subtract), a counterclockwise rotation means you subtract 15 degrees: 180 − 15 = 165 degrees.

Question 56: Which of the following BEST defines 'wrap angle' (face form tilt) in frame fitting?

The horizontal curvature of the frame front that follows the face (Correct answer)
The tilt of the optical center relative to the pupil
The vertical angle between the lens plane and the patient's face
The angle of the temples relative to the frame front

Correct answer: The horizontal curvature of the frame front that follows the face

Wrap angle (face form tilt) is the horizontal curvature of the frame front that allows it to conform to the contour of the patient's face.

Question 57: What does the term 'effective diameter' (ED) mean in lens ordering?

The actual measured diameter of the finished lens blank
The distance from the optical center to the furthest frame edge
The thickness of the lens at the optical center
The smallest circle that encloses the entire frame aperture (Correct answer)

Correct answer: The smallest circle that encloses the entire frame aperture

Effective diameter is the diameter of the smallest circle that circumscribes the frame aperture, used to determine the minimum blank size needed.

Question 58: The push-up test during soft contact lens fitting is used to assess what parameter?

Lens movement and fit tightness (lens mobility) (Correct answer)
Lens optical power
Lens water content suitability
Corneal curvature changes

Correct answer: Lens movement and fit tightness (lens mobility)

The push-up test assesses lens mobility by using a finger to push the lower lid against the lens edge; a properly fitting lens should move smoothly and return to its original position.

Question 59: A patient's frame is made of memory metal (beta-titanium or Flexon). What is the key advantage of this material for active patients?

It has the highest Abbe value of any frame material
It cannot be adjusted after manufacture
It returns to its original shape after bending, reducing breakage (Correct answer)
It is completely non-conductive and safe in MRI machines

Correct answer: It returns to its original shape after bending, reducing breakage

Memory metal alloys (beta-titanium) are superelastic and return to their original shape after bending, making them very durable for active patients.

Question 60: Which anti-reflective coating layer is responsible for bonding the AR stack to the lens surface?

Adhesion layer (Correct answer)
Top coat
Multi-layer stack
Hard coat

Correct answer: Adhesion layer

The adhesion layer (base layer) chemically bonds the AR coating stack to the lens substrate, ensuring durability of the entire coating system.

Question 61: A high-minus lens is best fabricated with which base curve strategy to minimize edge thickness?

Flatter base curve (Correct answer)
Plano base curve
Same as vertex power
Steeper base curve

Correct answer: Flatter base curve

Flatter base curves on minus lenses reduce edge thickness by allowing the front surface to be less curved.

Question 62: A lens with a base curve of +6.00 D and a back surface power of -2.50 D has what front vertex power?

+8.50 D
+3.50 D (Correct answer)
-3.50 D
+3.00 D

Correct answer: +3.50 D

Front vertex power equals base curve plus back surface power: +6.00 + (-2.50) = +3.50 D.

Question 63: What is the primary optical purpose of a progressive addition lens (PAL)?

To increase the field of view in the peripheral zones
To provide a seamless gradient of power from distance at the top to near at the bottom (Correct answer)
To reduce chromatic aberration across the entire lens
To correct astigmatism with a cylindrical correction only

Correct answer: To provide a seamless gradient of power from distance at the top to near at the bottom

A PAL provides a continuous, invisible progression of plus power from the distance zone at the top to the reading zone at the bottom, eliminating the visible segment line.

Question 64: The distance vision zone of a progressive addition lens is located:

In the nasal portion of the lens
At the fitting cross level
Below the fitting cross
Above the fitting cross (Correct answer)

Correct answer: Above the fitting cross

In a PAL, the distance zone is positioned above the fitting cross, with the intermediate corridor below and near zone at the bottom.

Question 65: While specific regulations vary by state, which of the following tasks is almost universally considered outside the legal scope of practice for a dispensing optician?

Fitting and adjusting a patient's new eyeglass frames.
Measuring a patient's pupillary distance.
Neutralizing a lens in a lensometer to verify its power.
Performing a refraction to determine a new prescription. (Correct answer)

Correct answer: Performing a refraction to determine a new prescription.

The scope of practice for a dispensing optician involves interpreting and filling a valid prescription written by a licensed optometrist or ophthalmologist. Performing a refraction, which is the clinical examination to determine the eye's refractive error and write a prescription, is restricted to optometrists and ophthalmologists.

Question 66: A patient with presbyopia wants contact lenses. Which design uses different optical zones on a single lens to provide both distance and near vision?

Bifocal spectacle
Simultaneous vision multifocal (Correct answer)
Monovision
Translating bifocal soft lens

Correct answer: Simultaneous vision multifocal

Simultaneous vision multifocal contact lenses have concentric or aspheric zones that present both distance and near prescriptions to the eye at the same time.

Question 67: A patient alleges that an optician's negligent dispensing of incorrect lenses caused them to have repeated headaches and vision problems. To prevail on a negligence claim, the patient must prove:

Gross negligence, since ordinary negligence is not actionable for licensed professionals
Duty, breach of duty, causation, and damages (Correct answer)
Only that the optician was licensed and made an error
Intent to harm, causation, and amount of damages only

Correct answer: Duty, breach of duty, causation, and damages

A negligence claim requires proving all four elements: duty of care, breach of that duty, causation linking the breach to the injury, and actual damages.

Question 68: A patient asks about the difference between a gradient tint and a solid tint. The key difference is:

Gradient tints block more UV radiation
Solid tints are only available in gray
Gradient tints transition from darker at the top to lighter at the bottom (Correct answer)
Gradient tints are always polarized

Correct answer: Gradient tints transition from darker at the top to lighter at the bottom

A gradient tint fades from a darker concentration at the top of the lens (blocking overhead glare) to a lighter or clear area at the bottom (for reading or near tasks).

Question 69: During frame selection, you notice a patient has a very narrow nose bridge. Which frame feature should you prioritize?

Skull temples with tight bend
Saddle bridge with low DBL
Wide keyhole bridge
Adjustable nose pads on pad arms (Correct answer)

Correct answer: Adjustable nose pads on pad arms

Adjustable nose pads on pad arms allow precise customization to fit a narrow nasal bridge securely and comfortably.

Question 70: An antireflective (AR) coating works by:

Increasing the refractive index of the lens
Absorbing light at the lens surface
Polarizing reflected light
Destructive interference of reflected light waves (Correct answer)

Correct answer: Destructive interference of reflected light waves

AR coatings use thin film layers where reflected waves are out of phase and cancel each other through destructive interference.

Question 71: What is the primary function of a hydrophobic coating applied over an anti-reflective coating?

To harden the lens and increase scratch resistance below the AR layer
To reduce electrostatic charge that attracts dust particles
To repel water, oils, and smudges from the lens surface (Correct answer)
To prevent ultraviolet radiation from degrading the AR coating

Correct answer: To repel water, oils, and smudges from the lens surface

A hydrophobic (water-repelling) top coat causes water and oils to bead up and roll off the lens surface, reducing smudging and making the lens easier to clean.

Question 72: Which of the following frame materials has the lowest density (lightest weight per unit volume)?

Titanium
Zylonite (cellulose acetate)
Beryllium
TR-90 nylon (Correct answer)

Correct answer: TR-90 nylon

TR-90 is an ultra-lightweight thermoplastic nylon with one of the lowest densities of all spectacle frame materials.

Question 73: During a verification, the lensometer reading shows 2.00 prism diopters base-in in one lens not called for in the prescription. This is most likely caused by:

Segment height error
Optical center displaced nasally from the pupil center (Correct answer)
Incorrect vertex distance
Incorrect axis setting

Correct answer: Optical center displaced nasally from the pupil center

When the optical center is displaced nasally relative to the pupil, Prentice's Rule produces unwanted base-in prism in that lens.

Question 74: A photochromic lens that does not darken adequately in a car is most likely because:

The lens material is too thin
The lens is defective
The temperature is too high
UV light is blocked by the windshield (Correct answer)

Correct answer: UV light is blocked by the windshield

Modern automotive windshields block UV radiation, which is required to activate photochromic dye molecules, preventing the lenses from darkening inside a vehicle.

Question 75: What is the primary purpose of the lens edge lift in an RGP contact lens fit?

To allow tear exchange and lens movement (Correct answer)
To increase center thickness
To improve UV protection
To correct astigmatism

Correct answer: To allow tear exchange and lens movement

Edge lift in RGP lens design promotes tear exchange beneath the lens and allows adequate lens movement for corneal health.

Question 76: What does the term 'lenticular lens' describe?

A bifocal with a lenticular segment
A lens with a prism ground into the carrier
A high-power lens with a central optical zone and non-optical carrier (Correct answer)
A lens designed for contact lens correction

Correct answer: A high-power lens with a central optical zone and non-optical carrier

A lenticular lens has the prescription ground only in a central optical zone (bowl), with a non-prescription carrier that reduces thickness and weight in high-power lenses.

Question 77: What sort of lens has a surface that is both convex and concave?

Biconcave
Meniscus (Correct answer)
Plano-convex
Biconvex

Correct answer: Meniscus

One convex and one concave surface make up a meniscus lens. A positive meniscus lens is steeper on the convex side, making it thicker at the center and thinner on the edges, whereas a negative meniscus is thinner at the center than at the edges. Both myopic and hyperopic eyes can have their vision corrected with meniscus lenses. A biconvex lens has two convex surfaces, whereas a biconcave lens has two concave surfaces. One flat surface and one convex surface make up a plano-convex lens.

Question 78: Which layer of the cornea is responsible for pumping excess fluid out of the stroma to maintain its clarity?

Bowman's Layer
Descemet's Membrane
Epithelium
Endothelium (Correct answer)

Correct answer: Endothelium

The endothelium is the innermost layer of the cornea and its primary function is to act as a pump, removing excess fluid from the stroma. This pumping action is crucial for maintaining the cornea's transparency and preventing swelling that would lead to hazy vision.

Question 79: A child's frame sits very close to the eyelashes, causing lens contact. The BEST adjustment is to:

Increase the vertex distance by opening the nose pads outward (Correct answer)
Decrease the vertex distance by tightening the nose pads
Increase pantoscopic tilt to push the bottom of the frame away
Bend the temples upward at the ear bend

Correct answer: Increase the vertex distance by opening the nose pads outward

Increasing vertex distance by adjusting nose pads to widen their spread moves the frame away from the face, clearing the eyelashes.

Question 80: When using a lensometer on a trifocal lens, the intermediate add power is calculated as:

The difference between the near and distance readings
The same as the near add
Half of the reading add power
Half of the total add, measured at the intermediate segment (Correct answer)

Correct answer: Half of the total add, measured at the intermediate segment

The intermediate segment of a trifocal is measured directly through the lensometer, and its power (typically half of the full add) is read at that specific zone.

Question 81: A patient's frame has a bridge size of 18 and an eye size of 52. Using the boxing system, what is the distance between lenses (DBL)?

52 mm
18 mm (Correct answer)
70 mm
34 mm

Correct answer: 18 mm

In the boxing system, the bridge size (DBL) is the measurement between the two lenses, which in this case is 18 mm.

Question 82: What does the base curve (BC) of a contact lens refer to?

The refractive power of the lens
The thickness at the center of the lens
The total diameter of the lens
The radius of curvature of the back surface of the lens (Correct answer)

Correct answer: The radius of curvature of the back surface of the lens

The base curve is the radius of curvature of the posterior (back) surface of a contact lens, typically measured in millimeters.

Question 83: A patient complains of facial pressure behind the ears after wearing new glasses for one hour. The FIRST adjustment to check is:

Nose pad width
Frame front alignment
Pantoscopic tilt
Temple length and bend position (Correct answer)

Correct answer: Temple length and bend position

Discomfort behind the ears is usually caused by temples that are too short or have their bend positioned too far forward.

Question 84: A client is having difficulty moving their eye outward, toward their temple. This indicates a potential issue with which extraocular muscle?

Inferior Rectus
Superior Oblique
Medial Rectus
Lateral Rectus (Correct answer)

Correct answer: Lateral Rectus

The lateral rectus muscle is responsible for abducting the eye, which is the movement of the eye outward, away from the nose and toward the temple. Difficulty with this specific movement points to a problem with the function of the lateral rectus.

Question 85: The FDA classifies prescription spectacle lenses as which type of medical device?

Class III (premarket approval)
Not classified as a medical device
Class I (general controls)
Class II (special controls) (Correct answer)

Correct answer: Class II (special controls)

Prescription spectacle lenses are classified by the FDA as Class II medical devices, subject to special controls and 510(k) requirements.

Question 86: Which tool is used to measure the distance between the back surface of a lens and the patient's cornea?

Pupillometer
Geneva lens clock
Distometer (Correct answer)
Lensometer

Correct answer: Distometer

A distometer (also called a vertex distance gauge) measures the back vertex distance from the lens to the corneal apex.

Question 87: When verifying a finished bifocal, what is the ANSI Z80.1 tolerance for segment height difference between the two lenses?

1.0 mm (Correct answer)
2.0 mm
1.5 mm
0.5 mm

Correct answer: 1.0 mm

ANSI Z80.1 permits a maximum of 1.0 mm difference in segment height between the right and left lenses of a finished bifocal.

Question 88: According to ANSI Z87.1 standards for basic impact safety lenses, what is the minimum thickness required for a high-index plastic lens?

2.0 mm
2.2 mm
3.0 mm (Correct answer)
2.5 mm

Correct answer: 3.0 mm

The ANSI Z87.1 standard requires that for basic impact resistance, high-index plastic and glass lenses must have a minimum thickness of 3.0 mm. Polycarbonate and Trivex lenses, which are more impact-resistant, can have a minimum thickness of 2.0 mm for high-impact rating.

Question 89: A lens marked with a red dot indicates:

The temporal side for progressive lenses (Correct answer)
The optical center location
A photochromic coating
The prism reference point

Correct answer: The temporal side for progressive lenses

Red dots on progressive lenses mark the temporal side to help with proper orientation during dispensing.

Question 90: On a manual lensometer, what is the purpose of rotating the eyepiece reticle before beginning a measurement?

To align the axis wheel
To focus the reticle for the examiner's own eye (Correct answer)
To set the prism reference
To calibrate the power drum

Correct answer: To focus the reticle for the examiner's own eye

Rotating the eyepiece adjusts the reticle to be sharply focused for the individual examiner's eye, correcting for their own ametropia.

Question 91: The non-contact tonometer (NCT) measures intraocular pressure by detecting what?

Corneal curvature changes
Electrical resistance across the cornea
Pupil dilation response
The time or force needed to applanate the cornea with an air puff (Correct answer)

Correct answer: The time or force needed to applanate the cornea with an air puff

The NCT uses a calibrated puff of air and detects the time or force required to momentarily flatten (applanate) the cornea, correlating this to IOP.

Question 92: What is the purpose of the 'fitting cross' marked on a progressive lens before edging?

Marks the pupil alignment point used to set fitting height (Correct answer)
Marks the optical center of the distance zone
Indicates the corridor width
Identifies the near add power location

Correct answer: Marks the pupil alignment point used to set fitting height

The fitting cross is placed at the patient's pupil level to set the lens' intermediate corridor in the correct vertical position.

Question 93: A patient with anisometropia requires the optical centers of the lenses to be at different heights. This is best described as:

Differential vertical decentration
Slab-off correction (Correct answer)
Horizontal prism balance
Compensatory prism

Correct answer: Slab-off correction

Slab-off (or reverse slab-off) grinds prism into the reading zone of one lens to equalize the vertical imbalance caused by anisometropia.

Question 94: Which of the following actions by an optician would most likely constitute practicing outside their scope of practice in most U.S. states?

Adjusting a patient's frame at the nose pads
Dispensing non-prescription sunglasses
Diagnosing a patient with myopia and prescribing corrective lenses (Correct answer)
Interpreting an optical prescription and fabricating lenses

Correct answer: Diagnosing a patient with myopia and prescribing corrective lenses

Diagnosing refractive errors and prescribing lenses is within the scope of optometrists or ophthalmologists, not opticians.

Question 95: For a patient with a high minus prescription, which frame characteristic minimizes unwanted prismatic effects and lens thickness?

Small eye size with minimal decentration (Correct answer)
Rimless with extended temples
Large bridge with low pantoscopic tilt
Large eye size with high wrap

Correct answer: Small eye size with minimal decentration

A small eye size reduces the amount of lens needed and minimizes edge thickness and prism induced by decentration in minus lenses.

Question 96: Which instrument would an optician use to verify that a finished spectacle lens has the correct base curve?

Geneva lens clock (Correct answer)
Lensometer
Keratometer
Pupillometer

Correct answer: Geneva lens clock

A Geneva lens clock (lens measure) measures the surface curvature of a spectacle lens to verify its base curve.

Question 97: A patient completes their eye examination and the optometrist presents them with a bill. The patient asks for a copy of their new prescription to shop for glasses elsewhere. The office manager states it is their policy to only release the prescription after the patient has purchased eyewear from their optical. This policy is in direct violation of which rule?

The HIPAA Patient's Right to Access
The FTC Eyeglass Rule (Correct answer)
The Contact Lens Rule
State Opticianry Board Scope of Practice

Correct answer: The FTC Eyeglass Rule

The Federal Trade Commission (FTC) Eyeglass Rule requires prescribers to provide the patient with a copy of their spectacle prescription immediately after the eye exam is completed. They cannot charge an extra fee for it or condition its release on the purchase of eyewear.

Question 98: The base curve of an ophthalmic lens is BEST described as:

The distance between lens centers
The total optical power of the lens
The thinnest point of the lens
The curvature of the front surface measured in diopters (Correct answer)

Correct answer: The curvature of the front surface measured in diopters

The base curve refers to the front surface curve of the lens, expressed in diopters, which helps maintain proper optical performance and cosmetic appearance.

Question 99: A patient reports seeing faint colored (rainbow) reflections in their new AR-coated lenses when viewed from the side. What is the most accurate explanation to provide?

The coating was applied at an incorrect thickness during manufacturing
This is a normal characteristic of AR coatings caused by thin-film light interference, and the residual color is intentional (Correct answer)
The AR coating is defective and the lenses must be remade immediately
The lenses were exposed to excessive heat during the dispensing process

Correct answer: This is a normal characteristic of AR coatings caused by thin-film light interference, and the residual color is intentional

The faint colored residual reflection (often green or blue-green) seen on AR-coated lenses is an intentional result of thin-film interference and actually indicates a properly functioning AR coating.

Question 100: Which of the following is the first and most critical step an optician must perform before using a manual lensometer to ensure accurate readings for any patient's glasses?

Setting the power drum to the approximate sphere power of the lens.
Focusing the eyepiece for their own eye. (Correct answer)
Placing the glasses with the temples facing away from the operator.
Turning the power drum to +10.00 to fog the target.

Correct answer: Focusing the eyepiece for their own eye.

Before any measurements are taken, the eyepiece of the lensometer must be focused for the individual operator's eye. This is done by turning the eyepiece to the most plus setting, then slowly turning it back until the reticle (crosshairs) is in sharp focus. Failure to do so will introduce error into all subsequent power readings.

Question 101: According to the ANSI Z80.1-2020 tolerance standards, what is the allowable tolerance for sphere power for a prescription of -4.75 D?

±0.18 D
±0.13 D (Correct answer)
±0.16 D
±0.25 D

Correct answer: ±0.13 D

The American National Standards Institute (ANSI) Z80.1-2020 standards provide guidelines for prescription ophthalmic lenses. For a single vision lens with a spherical power between +6.50 D and -6.50 D, the tolerance is ±0.13 D.

Question 102: In states that do not license opticians, who typically has authority to establish the minimum competency standards for opticianry practice?

Individual employers or optical chains (Correct answer)
The American Board of Opticianry (ABO)
The federal government through the NOCE exam
State optometry boards acting as a proxy

Correct answer: Individual employers or optical chains

In states without licensure, no government body sets minimum competency standards, so individual employers determine their own hiring and skill requirements.

Question 103: According to ANSI Z80.1 standards, what is the maximum allowable tolerance for sphere power in a finished single vision lens (for powers up to ±6.50 D)?

±0.50 D
±0.25 D
±0.13 D (Correct answer)
±0.06 D

Correct answer: ±0.13 D

ANSI Z80.1 allows ±0.13 D tolerance for sphere power in single vision lenses with powers up to ±6.50 D.

Question 104: An optical coherence tomographer (OCT) used in an optical setting primarily helps the optician by:

Calculating pupillary distance automatically
Detecting macular pathology that may affect vision correction outcomes (Correct answer)
Measuring corneal curvature for contact lens fitting
Verifying spectacle lens power

Correct answer: Detecting macular pathology that may affect vision correction outcomes

OCT imaging can detect retinal pathology such as macular degeneration that may explain reduced visual acuity not correctable with spectacles.

Question 105: The image formed by a converging lens when the object is placed between the focal point and the lens is:

Real, erect, and reduced
Virtual, erect, and magnified (Correct answer)
Virtual, inverted, and reduced
Real, inverted, and magnified

Correct answer: Virtual, erect, and magnified

When an object is inside the focal length of a converging lens, the image is virtual (same side as object), erect, and magnified — this is the principle of a magnifying glass.

Question 106: Which ANSI standard specifies the minimum impact resistance requirements for dress eyewear sold in the United States?

ANSI Z87.1
ANSI Z80.1 (Correct answer)
ANSI Z136.1
ANSI Z80.3

Correct answer: ANSI Z80.1

ANSI Z80.1 covers requirements for prescription ophthalmic lenses including the drop-ball impact test that all dress eyewear lenses must pass before dispensing.

Question 107: When assessing the fit of a soft contact lens using a slit lamp, a well-fitting lens should demonstrate how much movement on a blink?

0.25–0.50 mm (Correct answer)
1.00–2.00 mm
Less than 0.10 mm
More than 3.00 mm

Correct answer: 0.25–0.50 mm

A properly fitting soft contact lens should move approximately 0.25–0.50 mm with each blink to ensure adequate tear exchange and corneal oxygenation.

Question 108: Which frame adjustment increases the distance between the lens back vertex and the cornea?

Moving the nose pads forward to push the frame away from the face (Correct answer)
Increasing pantoscopic tilt
Extending the temple length
Spreading the nose pads farther apart

Correct answer: Moving the nose pads forward to push the frame away from the face

Moving nose pads forward on their arms pushes the frame away from the face, increasing vertex distance between the lens and the cornea.

Question 109: Which of the following best describes 'therapeutic privilege' as it might apply in an optical context?

The legal right of an optical lab to skip impact testing on safety lenses
An optician's right to substitute a lens material without telling the patient
A prescriber's rare and legally controversial ability to withhold information if full disclosure would seriously harm the patient (Correct answer)
An employer's right to exempt staff from HIPAA training

Correct answer: A prescriber's rare and legally controversial ability to withhold information if full disclosure would seriously harm the patient

Therapeutic privilege is a narrow and controversial doctrine allowing a clinician to withhold information if disclosure would cause serious harm, but it is disfavored and rarely applicable.

Question 110: An optician who holds the ABO certification and wishes to maintain it must fulfill continuing education requirements set by the ABO. Failure to complete CE by the renewal deadline will result in:

An automatic 6-month grace period with no penalty
Suspension of state licensure regardless of state board requirements
A requirement to retake the full ABO written exam immediately
Loss of ABO certification until CE requirements are met and renewal conditions are satisfied (Correct answer)

Correct answer: Loss of ABO certification until CE requirements are met and renewal conditions are satisfied

Failure to complete ABO CE requirements by the renewal deadline results in loss of ABO certification; the optician must fulfill reinstatement requirements to regain it.

Question 111: When dispensing safety eyewear under ANSI Z87.1, which lens material meets the basic impact standard without additional testing for most occupational applications?

Standard CR-39 at 2mm center thickness
High-index 1.74 at 1.5mm
Trivex at 1.0mm center thickness
Polycarbonate at 2mm center thickness (Correct answer)

Correct answer: Polycarbonate at 2mm center thickness

Polycarbonate inherently meets the ANSI Z87.1 basic impact requirements at 2mm center thickness due to its high impact resistance.

Question 112: On a manual lensometer, what does a clear, sharp image of the target mires indicate?

The cylinder axis is aligned
The lens is properly centered
The sphere power has been neutralized (Correct answer)
The add power is correct

Correct answer: The sphere power has been neutralized

When the target mires appear clear and sharp in the lensometer eyepiece, the sphere power of the lens has been neutralized.

Question 113: Which federal law mandates that ophthalmic lenses dispensed in the US must be impact-resistant unless specifically exempted in writing by the prescriber?

FDA Impact-Resistant Lens Regulation (21 CFR 801.410) (Correct answer)
FTC Eyeglass Rule
OSHA 29 CFR 1910.133
Americans with Disabilities Act

Correct answer: FDA Impact-Resistant Lens Regulation (21 CFR 801.410)

21 CFR 801.410 requires that all prescription ophthalmic lenses be impact-resistant, with limited medical exceptions documented by the prescriber.

Question 114: Which segment of patients would most benefit from scleral contact lenses?

Patients with severe dry eye disease or irregular corneas (Correct answer)
Patients with low myopia and healthy corneas
Patients who prefer daily disposable lenses
Presbyopic patients wanting reading correction only

Correct answer: Patients with severe dry eye disease or irregular corneas

Scleral lenses vault completely over the cornea and rest on the sclera, providing a fluid reservoir that relieves severe dry eye and corrects irregular corneas.

Question 115: When using a lensometer to measure prism in a lens, the target mires are displaced 2 cm on the reticle. What does this represent?

20 prism diopters
0.2 prism diopters
2 degrees of prism
2 prism diopters (Correct answer)

Correct answer: 2 prism diopters

On a standard lensometer reticle, each 1 cm (10 mm) of displacement equals 1 prism diopter, so 2 cm = 2 prism diopters.

Question 116: Which lens material has the highest Abbe value, indicating the least chromatic aberration?

High-index 1.74
Trivex
Polycarbonate
Crown glass (Correct answer)

Correct answer: Crown glass

Crown glass has an Abbe value of approximately 59, the highest among common ophthalmic materials, meaning it produces the least chromatic aberration.

Question 117: Standard CR-39 plastic (allyl diglycol carbonate) has an index of refraction of approximately:

1.74
1.60
1.49 (Correct answer)
1.53

Correct answer: 1.49

CR-39 has an index of approximately 1.499 (commonly cited as 1.49 or 1.50).

Question 118: Which of the following represents the correct transposition of the prescription +1.75 +2.50 x 080?

+4.25 +2.50 x 170
+4.25 -2.50 x 170 (Correct answer)
-0.75 +2.50 x 080
-0.75 -2.50 x 170

Correct answer: +4.25 -2.50 x 170

To transpose a prescription from plus cylinder to minus cylinder form, follow these three steps: 1. Calculate the new sphere by algebraically adding the original sphere and cylinder powers (+1.75 + +2.50 = +4.25). 2. Change the sign of the cylinder (+2.50 becomes -2.50). 3. Change the axis by 90 degrees (80 + 90 = 170). Therefore, the transposed prescription is +4.25 -2.50 x 170.

Question 119: Which type of lens treatment is applied to create a reflective, mirror-like appearance on the front surface of sunglasses?

Photochromic molecular treatment throughout the lens
Anti-reflective coating applied to the front surface only
Flash or mirror coating deposited on the front surface (Correct answer)
Polarized filter embedded in the lens substrate

Correct answer: Flash or mirror coating deposited on the front surface

A flash or mirror coating is a vacuum-deposited metallic layer on the front surface that creates a reflective appearance while reducing visible light transmission.

Question 120: What type of aberration causes light rays at different distances from the optical axis to focus at different points?

Coma
Chromatic aberration
Spherical aberration (Correct answer)
Field curvature

Correct answer: Spherical aberration

Spherical aberration occurs because peripheral rays focus at a different point than paraxial rays due to the spherical lens surface.

Question 121: When comparing CR-39 to high-index 1.74 material, which statement is MOST accurate?

High-index 1.74 has a higher Abbe value than CR-39
High-index 1.74 produces thinner lenses but has more chromatic aberration (Correct answer)
CR-39 produces thinner lenses for the same prescription
CR-39 has a higher refractive index than high-index 1.74

Correct answer: High-index 1.74 produces thinner lenses but has more chromatic aberration

High-index 1.74 produces thinner, lighter lenses for strong prescriptions but has a lower Abbe value (around 33) compared to CR-39 (Abbe ~58), meaning more chromatic aberration.

Question 122: A patient's adult child calls the optical dispensary to ask for the patient's prescription details to order glasses online. The patient's file has no specific authorization to release information to this individual. According to the Health Insurance Portability and Accountability Act (HIPAA), what is the most appropriate action for the optician?

Inform the caller that without the patient's written consent, they cannot release protected health information. (Correct answer)
Mail a copy of the prescription to the patient's home address upon request.
Tell the child to have the patient call and provide verbal authorization over the phone.
Provide the prescription details over the phone to be helpful.

Correct answer: Inform the caller that without the patient's written consent, they cannot release protected health information.

The Health Insurance Portability and Accountability Act (HIPAA) Privacy Rule protects a patient's health information. An eyeglass prescription is considered protected health information (PHI). Releasing this information to a third party, even a family member, requires explicit, preferably written, authorization from the patient. Informing the caller of this requirement is the only action that complies with federal law.

Question 123: A blue light filtering lens coating is designed to block light primarily in which wavelength range?

550–650 nm
700–800 nm
380–500 nm (Correct answer)
200–280 nm

Correct answer: 380–500 nm

Blue light filtering lenses target the 380–500 nm range (high-energy visible light), which includes the violet and blue wavelengths associated with digital screen exposure.

Question 124: When using a lensometer on a high-minus lens with significant spherical aberration, what technique improves measurement accuracy?

Use the full aperture of the instrument
Rotate the lens to 45 degrees
Increase the illumination to maximum
Stop down the aperture using the iris diaphragm (Correct answer)

Correct answer: Stop down the aperture using the iris diaphragm

Stopping down the aperture (using the iris diaphragm) reduces aberrations and makes the target appear sharper for high-power lenses.

Question 125: According to the FTC Eyeglass Rule, what is the maximum period an ophthalmic prescription can be considered valid if no expiration date is specified by the prescriber?

The FTC does not set a default; state law governs (Correct answer)
2 years
1 year
6 months

Correct answer: The FTC does not set a default; state law governs

The FTC Eyeglass Rule does not establish a default prescription expiration; expiration periods are governed by individual state laws.

Question 126: A patient fitted with a new single vision Rx reports blurry vision in primary gaze but clear vision when they tilt their head. This most likely indicates:

Incorrect sphere power
Insufficient pantoscopic tilt
Optical centers placed too high or too low relative to the pupils (Correct answer)
Incorrect cylinder axis

Correct answer: Optical centers placed too high or too low relative to the pupils

When OCs are vertically misplaced, the patient involuntarily tilts their head to bring the pupil into alignment with the OC.

Question 127: When comparing polycarbonate and Trivex lens materials for a drill-mounted frame, Trivex is often preferred due to its superior:

Abbe value
Specific gravity
Tensile strength (Correct answer)
Refractive index

Correct answer: Tensile strength

Trivex has a higher tensile strength than polycarbonate, making it more resistant to cracking and splitting around drill holes. This makes it an ideal choice for rimless or drill-mounted frames where the lens material itself must bear structural stress. While polycarbonate has excellent impact resistance, its lower tensile strength makes it more prone to stress fractures in this type of mounting.

Question 128: Slab-off prism is used to correct vertical imbalance caused by:

Prism vergence at near
Base curve differences between lenses
Anisometropia when reading through off-center lenses (Correct answer)
Horizontal phoria at distance

Correct answer: Anisometropia when reading through off-center lenses

Slab-off (bicentric grinding) compensates for differential vertical prism induced by anisometropic lenses when the eyes depress for near tasks.

Question 129: During an eye movement test, a patient is asked to look toward their nose. This medial movement of the eye is called adduction and is primarily controlled by which extraocular muscle?

Inferior Rectus
Superior Oblique
Medial Rectus (Correct answer)
Lateral Rectus

Correct answer: Medial Rectus

The medial rectus muscle is the primary muscle responsible for adduction, which is the movement of the eye inward, toward the nose. The lateral rectus is its antagonist, responsible for abduction (outward movement).

Question 130: A patient's frame is under a manufacturer's warranty, but the damage is clearly caused by patient misuse. The optician should:

Automatically replace the frame at no charge to maintain goodwill
File a warranty claim and let the manufacturer decide without informing the patient
Submit the claim to the manufacturer as warranty, omitting the cause
Inform the patient the damage is not covered under warranty and discuss repair or replacement options (Correct answer)

Correct answer: Inform the patient the damage is not covered under warranty and discuss repair or replacement options

Misuse-related damage typically voids a manufacturer's warranty, and the optician must honestly inform the patient of coverage limits and available options.

Question 131: When using a Geneva lens measure on a minus lens, the gauge pointer deflects:

In the positive direction
In the negative direction (Correct answer)
It does not deflect
In either direction depending on lens index

Correct answer: In the negative direction

A minus (concave) lens surface causes the center pin of the Geneva lens measure to be pushed back, resulting in a negative (minus) reading.

Question 132: What is the focal length of a +4.00 diopter lens?

40 cm
25 cm (Correct answer)
20 cm
50 cm

Correct answer: 25 cm

Focal length f = 1/D = 1/4.00 = 0.25 meters = 25 cm.

Question 133: Which of the following is the correct procedure when setting the axis of an astigmatic correction on the lensometer?

Set the drum to zero and rotate the lens
Use the prism compensator to neutralize the axis
Rotate the eyepiece until the mire is sharpest regardless of line direction
Align the axis wheel so the single line target is sharpest and note the axis reading (Correct answer)

Correct answer: Align the axis wheel so the single line target is sharpest and note the axis reading

The axis is found by rotating the lens until the single-line mire is clearest, then reading the axis from the lensometer scale.

Question 134: OSHA standard 29 CFR 1910.133 requires employers to provide which type of eyewear to employees?

Prescription sunglasses
Fashion frames with UV coating
Appropriate eye and face protection for occupational hazards (Correct answer)
Non-prescription readers

Correct answer: Appropriate eye and face protection for occupational hazards

OSHA 29 CFR 1910.133 mandates that employers ensure employees wear appropriate eye and face protection wherever there is a risk of eye injury from hazards.

Question 135: What always happens to light beams that pass through a "plus" lens?

Diverge
Cohere
Converge (Correct answer)
Disperse

Correct answer: Converge

A plus-power lens is designed such that light rays travelling through it will converge into a single point.

Question 136: The ANSI Z80.1 standard specifies that for a single-vision distance lens with a power of -5.00 D, the maximum allowable cylinder power error is:

±0.25 D
±0.13 D (Correct answer)
±0.50 D
±0.06 D

Correct answer: ±0.13 D

ANSI Z80.1 allows a cylinder tolerance of ±0.13 D for lenses with sphere powers between ±3.25 D and ±6.50 D.

Question 137: A patient with a prescription of +6.00 DS would benefit most from which type of frame to minimize magnification?

Small frame with aspheric high-index lenses (Correct answer)
Full-rim frame with large eye size
Large, round frame with thick rims
Rimless frame with standard CR-39 lenses

Correct answer: Small frame with aspheric high-index lenses

Aspheric designs flatten lens curves to reduce magnification, and a smaller eye size reduces center thickness in high plus prescriptions.

Question 138: An uncoated standard CR-39 plastic lens reflects approximately what percentage of incident light from each surface?

8% (Correct answer)
20%
12–15%
2–3%

Correct answer: 8%

An uncoated CR-39 lens reflects approximately 4% per surface (front and back combined approximately 8%), which AR coatings reduce to under 1% total.

Question 139: Using the lensmaker's equation with n=1.50, r₁=+200 mm, and r₂=+400 mm, what is the approximate lens power?

+2.50 D
+0.63 D
+1.25 D (Correct answer)
+3.75 D

Correct answer: +1.25 D

F = (n−1)(1/r₁ − 1/r₂) = 0.50 × (5.00 − 2.50) = +1.25 D.

Question 140: A patient with anisometropia requires a slab-off prism to correct for vertical imbalance at the reading level. On which lens is a conventional slab-off typically ground?

The lens with the most minus or least plus power in the vertical meridian. (Correct answer)
The lens with the highest cylinder power.
The lens with the most plus power in the vertical meridian.
The lens with the least minus power in the vertical meridian.

Correct answer: The lens with the most minus or least plus power in the vertical meridian.

A conventional slab-off is a base-up prism ground onto the back surface of the lens that has the most minus power or the least plus power in the vertical (90-degree) meridian. This counteracts the excessive base-down effect experienced when looking down to read through that lens.

Question 141: In a state where opticianry licensure is required, an optical dispensary hires an unlicensed individual to perform frame adjustments and dispense eyeglasses. The employer may be:

Required only to provide additional training within 90 days
Subject to penalties for aiding and abetting unlicensed practice (Correct answer)
Immune from liability as long as a licensed optician is on the premises
Permitted to do so under a supervised trainee exemption in all states

Correct answer: Subject to penalties for aiding and abetting unlicensed practice

Employers who knowingly allow unlicensed individuals to perform licensed activities can face penalties for aiding and abetting unlicensed practice.

Question 142: A patient's titanium frame temple has snapped at the hinge. What property of titanium makes soldering this repair particularly challenging?

Titanium is magnetic and deflects standard soldering tools
Titanium's high Abbe value increases optical aberrations
Titanium requires an inert gas atmosphere during welding to prevent oxidation (Correct answer)
Titanium's low melting point causes rapid deformation

Correct answer: Titanium requires an inert gas atmosphere during welding to prevent oxidation

Titanium reacts with oxygen and nitrogen at high temperatures, requiring an inert gas (argon) atmosphere or laser welding to make a clean, strong repair.

Question 143: Light diverging from a point source located 50 cm away has a vergence of:

-2.00 D (Correct answer)
-0.50 D
+0.50 D
+2.00 D

Correct answer: -2.00 D

Diverging light has negative vergence; V = -1/0.50 m = -2.00 D.

Question 144: What is the primary purpose of a lens's oleophobic coating?

Blocks UV light up to 400 nm
Repels oils and fingerprints from the lens surface (Correct answer)
Increases the scratch resistance of the hard coat
Prevents photochromic molecules from degrading

Correct answer: Repels oils and fingerprints from the lens surface

Oleophobic coatings repel oils from skin and fingerprints, making lenses easier to clean and maintaining better optical clarity during wear.

Question 145: Which frame material is most resistant to chemical solvents and is often recommended for patients who work in laboratory environments?

Zyl (cellulose acetate)
Titanium
Monel
Nylon (polyamide) (Correct answer)

Correct answer: Nylon (polyamide)

Nylon (polyamide) frames are highly resistant to chemical solvents and heat, making them suitable for laboratory or industrial environments.

Question 146: Which cleaning step is considered the MOST important part of the RGP lens care regimen to remove surface deposits?

Rubbing the lens with daily cleaner for 20–30 seconds (Correct answer)
Soaking the lens overnight in conditioning solution
Using enzymatic cleaner nightly
Rinsing the lens with sterile saline before insertion

Correct answer: Rubbing the lens with daily cleaner for 20–30 seconds

Mechanically rubbing the RGP lens with daily surfactant cleaner is the most effective step for removing protein, lipid, and debris deposits from the lens surface.

Question 147: A patient requests a copy of their contact lens prescription. Under the Contact Lens Rule, the prescriber must provide it:

Only if the patient pays a copying fee
Immediately upon completion of the fitting (Correct answer)
Only with written authorization from an optometrist
Within 30 days of the fitting

Correct answer: Immediately upon completion of the fitting

The FTC Contact Lens Rule requires prescribers to give patients a copy of their contact lens prescription at the completion of the fitting, at no extra charge.

Question 148: Using Prentice's rule, how much prism is induced when a patient looks 8mm below the optical center of a +3.00 D lens?

1.8 prism diopters
3.2 prism diopters
2.4 prism diopters (Correct answer)
0.8 prism diopters

Correct answer: 2.4 prism diopters

Prentice's rule: P = d × F = 0.8 cm × 3.00 = 2.4 prism diopters.

Question 149: A frame is described as having a 'keyhole bridge.' What does this describe?

A rigid saddle bridge with no nose pads
A bridge that adjusts for different nose widths via a sliding mechanism
A bridge with a very narrow, elongated opening that contacts the nose on both sides (Correct answer)
A bridge designed exclusively for high-minus prescriptions

Correct answer: A bridge with a very narrow, elongated opening that contacts the nose on both sides

A keyhole bridge has a narrow elongated shape, making contact on the sides of the nose, and is typically used on vintage or classic frame styles.

Question 150: Which lens treatment is MOST effective at reducing glare from wet roads for a driver?

Polarized lenses (Correct answer)
UV 400 coating
Anti-reflective coating
Photochromic lenses

Correct answer: Polarized lenses

Polarized lenses eliminate horizontally polarized light that creates glare from flat reflective surfaces like wet roads, water, and snow.

Question 151: What is the recommended care protocol for rigid gas-permeable (RGP) contact lens cases?

Clean the case monthly with boiling water only
Fill the case with tap water and close tightly each night
Rinse with fresh multipurpose solution, air dry face-down on a clean tissue, and replace every 3 months (Correct answer)
Store the case filled with saline at all times

Correct answer: Rinse with fresh multipurpose solution, air dry face-down on a clean tissue, and replace every 3 months

Lens cases should be rinsed with fresh contact lens solution (never tap water), air-dried face-down on a tissue, and replaced every 3 months to prevent microbial contamination.

Question 152: Which of the following prism diopter base directions would be indicated by a lensometer when the mire target is displaced superiorly from the optical center?

Base down (Correct answer)
Base up
Base in
Base out

Correct answer: Base down

When the target shifts superiorly in the lensometer eyepiece, it indicates base-down prism in the lens.

Question 153: Which verification step checks that prism has not been unintentionally introduced into a finished lens?

Measuring center thickness with a thickness gauge
Checking the cylinder axis with a protractor
Inspecting the lens for surface defects under magnification
Locating the optical center with a lensometer and comparing to the expected position (Correct answer)

Correct answer: Locating the optical center with a lensometer and comparing to the expected position

Locating the optical center with the lensometer confirms it is positioned where specified; a displaced OC introduces unwanted prism.

Question 154: What refractive state causes light to focus straight on the retina?

Emmetropia (Correct answer)
Myopia
Resbyopia
Hyperopia

Correct answer: Emmetropia

The medical word for spontaneously occurring vision is emmetropia. Because the light entering the eye focuses directly on the retina, an emmetropic eye does not require vision correction. When light concentrates behind the retina, a condition known as hyperopia, or farsightedness, results, whereas myopia, or nearsightedness, happens when light focuses in front of the retina.

Question 155: A third-party online contact lens seller sends a valid verification request to a prescriber's office at 10:00 AM on a Tuesday. The office is busy and does not respond. According to the FTC Contact Lens Rule's 'passive verification' provision, what is the status of this order at 10:00 AM on Wednesday?

The order is cancelled, and the seller must inform the patient.
The prescription is considered verified, and the seller can ship the order. (Correct answer)
The prescriber is automatically fined for non-response.
The seller must wait an additional 24 hours before taking any action.

Correct answer: The prescription is considered verified, and the seller can ship the order.

The FTC Contact Lens Rule states that if a prescriber does not respond to a valid verification request within eight business hours, the prescription is considered 'passively verified,' and the seller is permitted to fill and ship the order.

Question 156: Under the Americans with Disabilities Act (ADA), an optical dispensary that is open to the public must:

Make reasonable accommodations to ensure access for patients with disabilities (Correct answer)
Offer tele-optometry services as an alternative
Hire a minimum percentage of visually impaired staff
Provide free eyeglasses to patients with visual disabilities

Correct answer: Make reasonable accommodations to ensure access for patients with disabilities

The ADA requires places of public accommodation, including optical dispensaries, to make reasonable modifications to policies and physical access for individuals with disabilities.

Question 157: A patient with -5.00 D prescription switches from glass (n=1.523) to polycarbonate (n=1.586). The new lenses will be:

Thinner at the edges (Correct answer)
Thicker at the edges
The same thickness
Thinner only at the center

Correct answer: Thinner at the edges

Higher index materials require less curvature to achieve the same power, resulting in thinner edges for minus lenses.

Question 158: A licensed optician in a state that allows supervision of apprentices can supervise an apprentice dispensing glasses only if:

The apprentice holds a temporary federal certification
The apprentice has completed at least 2 years of on-the-job training
The apprentice has passed the ABO written exam
The supervising optician is physically present or immediately available as required by state law (Correct answer)

Correct answer: The supervising optician is physically present or immediately available as required by state law

Supervision requirements vary by state, but most require the licensed optician to be physically present or immediately available to oversee apprentice work.

Question 159: A patient's eyeglass prescription reads: OD -2.00 -1.00 x 090. The optician measures the finished lens and finds -2.00 -1.25 x 090. Under ANSI Z80.1, this lens:

Passes because the axis is correct
Fails because cylinder power exceeds the ±0.13 D tolerance for this power range (Correct answer)
Passes because sphere power is correct
Fails because any deviation from prescription is prohibited

Correct answer: Fails because cylinder power exceeds the ±0.13 D tolerance for this power range

ANSI Z80.1 allows a cylinder power tolerance of ±0.13 D for powers up to 2.00 D; a 0.25 D deviation exceeds this tolerance, so the lens fails.

Question 160: When using a frame heater (hot air or salt pan) to adjust a plastic frame, the frame should be:

Heated only at the hinge area to avoid warping the front
Immersed in boiling water for 60 seconds without touching
Heated evenly until pliable, then adjusted and held until cooled (Correct answer)
Heated until the plastic begins to whiten, then bent immediately

Correct answer: Heated evenly until pliable, then adjusted and held until cooled

The frame should be heated evenly until the plastic becomes pliable, then adjusted and held in the new position until it cools to retain the shape.

Question 161: During the final fitting of a new pair of glasses, the optician observes that the bottom edge of the frame front is angled significantly away from the patient's cheeks. To correct this and add proper pantoscopic tilt, what adjustment is required?

Angle the temples downward from the endpiece (Correct answer)
Bend the temple tips more sharply around the ear
Spread the nose pads farther apart
Bend the temples upward from the endpiece

Correct answer: Angle the temples downward from the endpiece

Increasing pantoscopic tilt involves angling the bottom of the frame front closer to the patient's cheeks. This is accomplished by bending the temples downward at the hinge or endpiece. This adjustment ensures the optical axis of the lens is properly aligned with the visual axis, especially when the patient is reading.

Question 162: Daily disposable contact lenses are designed to be worn for what maximum duration before disposal?

One week with nightly removal
30 days of continuous wear
One full day, then discarded (Correct answer)
One hour per day

Correct answer: One full day, then discarded

Daily disposable lenses are single-use lenses designed to be worn for one day and discarded each evening, eliminating the need for lens care solutions.

Question 163: What is the primary function of the pre-lens tear film in contact lens wear?

To lubricate the lens surface and maintain optical clarity (Correct answer)
To sterilize the contact lens during wear
To prevent lens dehydration permanently
To increase lens oxygen permeability

Correct answer: To lubricate the lens surface and maintain optical clarity

The pre-lens tear film provides lubrication, maintains a smooth optical surface over the contact lens, and supplies nutrients to the cornea.

Question 164: Under HIPAA's Minimum Necessary Standard, an optical office employee should share a patient's PHI:

Only to the extent needed to accomplish the intended purpose (Correct answer)
Only after obtaining written consent for each disclosure
Freely within the office since all staff are covered entities
In full whenever another staff member requests it

Correct answer: Only to the extent needed to accomplish the intended purpose

The Minimum Necessary Standard requires that only the least amount of protected health information needed to accomplish a specific task be accessed or disclosed.

Question 165: Blue light-filtering lenses are designed to reduce transmission of light in which approximate wavelength range?

500–600 nm (green to yellow visible light)
200–280 nm (UVC range)
380–500 nm (violet to blue visible light) (Correct answer)
620–700 nm (red visible light)

Correct answer: 380–500 nm (violet to blue visible light)

Blue light lenses target the 380–500nm range, which includes high-energy visible (HEV) blue-violet light associated with digital screens and linked to potential retinal and sleep-cycle concerns.

Question 166: A patient's prescription is +10.50 D sphere. The refraction was performed at a vertex distance of 12 mm, but the patient's chosen frame will sit at 17 mm. What is the compensated lens power that should be ordered?

+10.50 D
+10.00 D
+9.95 D
+11.00 D (Correct answer)

Correct answer: +11.00 D

When a plus lens is moved away from the eye, its effective power increases. To compensate, the ordered power must be decreased. The formula for vertex distance compensation is Fc = F / (1 - xF), where Fc is the compensated power, F is the original power, and x is the change in distance in meters. Here, F = +10.50 D and x = 5 mm = 0.005 m. The lens is moving away, so we use a negative value for x in the formula for a plus lens moving away from the eye: Fc = 10.50 / (1 - (-0.005 * 10.50)) = 10.50 / (1 + 0.0525) ≈ +9.97 D. However, the common convention is to reduce power. A simpler way is to find the effective power change: ΔF ≈ x * F^2 = 0.005 * (10.50)^2 = 0.55 D. Since the lens moved away, it acts stronger, so we must order a weaker lens. New Power = 10.50 - 0.55 = +9.95 D. The closest standard power is +10.00 D, but the most precise calculation points to decreasing the power. Re-evaluating with the correct formula for moving *away* from the eye: Fc = F / (1 + x*F) = +10.50 / (1 + 0.005 * 10.50) = +10.50 / 1.0525 = +9.97 D. The most common error is to add power. The correct action for a plus lens moving farther is to decrease the ordered power. Let's use the formula: New Power (Fc) = F / (1 + dF) where d is the distance moved in meters. Fc = 10.50 / (1 + (0.005 * 10.50)) = 9.97 D. Among the choices, +10.00 D is the closest answer representing a decrease in power. Let's re-verify the effect. Moving a plus lens away from the eye increases its effective power. The patient needs +10.50 D at 12mm. At 17mm, the lens is more effective, so we need to order a *weaker* lens to achieve the desired +10.50 D effect. A +10.00 D lens at 17mm will have an effective power of E.P. = F / (1 - dF) = 10.00 / (1 - 0.005*10.00) = 10.00 / 0.95 = +10.52 D. This is very close to the required +10.50 D. Conversely, if we ordered +11.00, its effective power would be even stronger. Therefore, reducing the power is correct.

Question 167: What is the purpose of the 'A' measurement in the boxing system?

The horizontal width of the lens aperture (Correct answer)
The distance between lens geometric centers
The overall frame front width
The vertical height of the lens aperture

Correct answer: The horizontal width of the lens aperture

In the boxing system, the 'A' measurement is the horizontal width of the lens aperture (eyewire opening), measured across the widest point of the bounding box.

Question 168: Which of the following correctly describes the function of the axis wheel on a manual lensometer?

It changes the add power reading
It rotates the target to align the cylinder axis of the lens (Correct answer)
It adjusts the total power of the lens
It adjusts the eyepiece for the examiner

Correct answer: It rotates the target to align the cylinder axis of the lens

The axis wheel rotates the lensometer target to align with the cylinder axis of the lens being measured, allowing the cylinder meridians to be properly read.

Question 169: Visual information from the nasal (medial) half of the right retina is transmitted along the visual pathway to which area of the brain?

The left primary visual cortex (Correct answer)
The right lateral geniculate nucleus only
The right primary visual cortex
The brainstem

Correct answer: The left primary visual cortex

At the optic chiasm, nerve fibers from the nasal half of each retina cross over to the opposite side of the brain. Therefore, information from the nasal half of the right retina crosses over and is processed in the left primary visual cortex.

Question 170: What determines how much light reaches the eye?

Fovea
Crystalline Lens
Pupil
Iris (Correct answer)

Correct answer: Iris

The iris muscles regulate the amount of light that enters the eye. These muscles regulate the pupil's size, causing it to enlarge (dilate) to let in more light or contract (constrain) to let in less light. The iris widens, enlarging the pupil in low light, and contracts, narrowing the pupil in high light. One-third of the eye's inherent power is produced by the crystalline lens, which is posterior to the iris and primarily composed of proteins. It focuses light into a picture on the retina. High-acuity vision is produced by the fovea, a small, flat point in the middle of the posterior region of the retina.

Question 171: A prism with its base at 270° will displace the image in which direction?

Nasally
Temporally
Upward (Correct answer)
Downward

Correct answer: Upward

The image is displaced toward the prism apex; base at 270° (down) means the apex is up, so the image shifts upward.

Question 172: A patient reports their daily wear soft contact lenses feel dry and uncomfortable by midday. Which product is most appropriate to recommend for in-eye use?

Saline nasal spray
Hydrogen peroxide solution
Artificial tears with preservatives
Rewetting drops formulated for contact lenses (Correct answer)

Correct answer: Rewetting drops formulated for contact lenses

Rewetting drops designed for contact lens wear are safe for in-eye use and help rehydrate the lens surface without disrupting the tear film.

Question 173: Continuing education (CE) requirements for licensed opticians serve primarily to:

Ensure practitioners maintain and update competency in a changing field (Correct answer)
Increase licensing revenue for state boards
Satisfy OSHA training mandates
Allow opticians to expand into prescribing roles

Correct answer: Ensure practitioners maintain and update competency in a changing field

CE requirements ensure that licensed opticians stay current with advances in technology, materials, and professional standards to protect public safety.

Question 174: A patient brings a handwritten prescription on plain paper with no letterhead. Under the FTC Eyeglass Rule, the optician should:

Refuse to fill it because letterhead is mandatory
Fill it if it contains all required elements: patient name, prescriber info, issue date, power, and prescriber signature (Correct answer)
Require the patient to get a printed prescription from the prescriber's office
Contact the FTC for guidance before dispensing

Correct answer: Fill it if it contains all required elements: patient name, prescriber info, issue date, power, and prescriber signature

The FTC Eyeglass Rule does not require letterhead; it requires the prescription to contain specific data elements, and a handwritten version meeting those requirements is valid.

Question 175: What is the primary purpose of mandatory reporting laws that may apply to opticians who observe signs of child abuse during patient encounters?

To allow the optician to act as an investigator on behalf of social services
To protect the optician from liability for reporting
To protect vulnerable individuals by requiring professionals to report suspected abuse to authorities (Correct answer)
To comply with OSHA workplace safety regulations

Correct answer: To protect vulnerable individuals by requiring professionals to report suspected abuse to authorities

Mandatory reporting laws require certain professionals to report suspected abuse to protect vulnerable individuals, overriding confidentiality in cases of potential harm.

Question 176: Vertex distance compensation in contact lens prescribing is generally required when the spectacle prescription exceeds what power?

±10.00 D
±2.00 D
±6.00 D
±4.00 D (Correct answer)

Correct answer: ±4.00 D

Vertex distance correction is clinically significant for prescriptions of ±4.00 D or greater, as the difference in back vertex distance between spectacles and contact lenses changes the effective power.

Question 177: When transposing -2.00 -1.50 × 090, the result is:

+2.00 -1.50 × 180
-3.50 -1.50 × 090
-2.00 +1.50 × 090
-3.50 +1.50 × 180 (Correct answer)

Correct answer: -3.50 +1.50 × 180

To transpose: new sphere = sum of sphere and cylinder (-2.00 + -1.50 = -3.50), new cylinder = opposite sign (+1.50), new axis = 90° away (180).

Question 178: A contact lens projection magnifier (shadowgraph) is used to measure which contact lens parameter by projecting an enlarged image?

Base curve radius
Diameter and surface quality (Correct answer)
Oxygen permeability
Center thickness

Correct answer: Diameter and surface quality

A shadowgraph projects an enlarged shadow image of a contact lens to measure its overall diameter and inspect surface quality or edge defects.

Question 179: What is the main functional benefit of applying a scratch-resistant (hard) coating to ophthalmic lenses?

It reduces surface micro-abrasions that degrade optical clarity over time (Correct answer)
It increases the flexibility of the lens material to resist cracking
It eliminates the need for an anti-reflective coating on the same lens
It makes the lens completely impervious to all surface damage

Correct answer: It reduces surface micro-abrasions that degrade optical clarity over time

Scratch-resistant coatings harden the lens surface to minimize micro-abrasions from everyday cleaning and handling, which preserves optical clarity over the life of the lens.

Question 180: When using a lensometer to verify prism, the amount of prism is measured by:

How far the target mires are displaced from the center of the reticle in prism diopters (Correct answer)
The separation of the mire lines in the focal plane
The difference in sphere power between the two principal meridians
The number of degrees the axis wheel is rotated

Correct answer: How far the target mires are displaced from the center of the reticle in prism diopters

Prism is measured by how far the target is displaced from the optical center of the lensometer reticle, with each unit of displacement corresponding to one prism diopter.

Question 181: The minimum blank size (MBS) formula for lens ordering is MBS =

Frame PD minus the patient's distance PD
Segment height plus pantoscopic tilt compensation
DBL + frame width ÷ 2
Effective diameter (ED) + 2 mm safety margin + 2 × decentration per side (Correct answer)

Correct answer: Effective diameter (ED) + 2 mm safety margin + 2 × decentration per side

MBS = ED + 2 × decentration + safety margin (typically 2 mm) to ensure the blank covers the entire edged lens.

Question 182: A patient's spectacle prescription is written with a cylinder power of -1.50. The optician transcribes it as -1.05 when entering the lab order. This error is best characterized as:

A transposition error constituting a dispensing mistake with potential liability (Correct answer)
A criminal act of falsification
A fabrication covered under the doctrine of informed consent
An acceptable rounding within optical tolerance

Correct answer: A transposition error constituting a dispensing mistake with potential liability

Transcribing -1.50 as -1.05 is a transposition error that falls outside acceptable ophthalmic tolerances and constitutes a dispensing mistake that could result in civil liability.

Question 183: A patient wants to purchase a one-year supply of their soft contact lenses. Their prescription on file expired two weeks ago. What is the legally required course of action for the optician?

Renew the prescription for one year based on their previous history.
Refuse to dispense any lenses until the patient provides a new, unexpired prescription. (Correct answer)
Dispense the lenses after the patient signs a liability waiver.
Sell them a single box to last until they can see their doctor.

Correct answer: Refuse to dispense any lenses until the patient provides a new, unexpired prescription.

Contact lenses are classified as Class II or Class III medical devices by the Food and Drug Administration (FDA). Federal law, including the Fairness to Contact Lens Consumers Act (FCLCA), prohibits the dispensing of contact lenses without a valid, unexpired prescription from a licensed prescriber. Selling lenses with an expired prescription is a violation of these regulations.

Question 184: An optician is preparing to adjust a pair of cellulose acetate frames for a patient. Which of the following instruments is most appropriate for making the frame material pliable, and what is a key precaution to take?

Axis pliers; use firm pressure to reshape the bridge.
An ultrasonic cleaner; ensure the frame is fully submerged.
A salt pan; use the highest temperature for rapid softening.
A hot air frame warmer; avoid concentrating heat in one spot to prevent damage. (Correct answer)

Correct answer: A hot air frame warmer; avoid concentrating heat in one spot to prevent damage.

A hot air frame warmer is the recommended and safest tool for adjusting most plastic frames, including cellulose acetate. It provides controlled, even heat. It is crucial to keep the frame moving and not concentrate the heat on a single area, as this can cause the material to burn, warp, or lose its finish.

Question 185: Which mechanism causes photochromic lenses to darken when the wearer moves outdoors?

Decreased temperature outdoors causes the chromic molecules to contract and absorb light
Increased visible light intensity activates the heat-sensitive dye layers
Infrared radiation from sunlight activates silver halide crystals in the lens
Exposure to ultraviolet (UV) radiation triggers a molecular change in the photochromic compounds (Correct answer)

Correct answer: Exposure to ultraviolet (UV) radiation triggers a molecular change in the photochromic compounds

Photochromic lenses contain UV-sensitive molecules (such as naphthopyrans) that undergo a reversible structural change when exposed to UV radiation, causing the lenses to darken.

Question 186: When using a Geneva lens clock (lens measure) on a plus lens, what do the pins indicate?

The center pin is depressed below the outer pins (Correct answer)
The center pin rises above the outer pins
All three pins align at the same level
The outer pins rise above the center pin

Correct answer: The center pin is depressed below the outer pins

On a plus lens, the curved surface pushes the center pin inward (down), indicating positive (convex) curvature.

Question 187: In automated lensometry, the instrument determines the cylinder axis by:

Requiring the technician to manually rotate until the mires align
Comparing front and back surface curvatures
Using a rotating detector array to sense the principal meridians electronically (Correct answer)
Measuring the polarization angle of transmitted light

Correct answer: Using a rotating detector array to sense the principal meridians electronically

Automated lensometers use electronic sensors or rotating detector arrays to automatically identify the principal meridians and determine cylinder axis without manual alignment.

Question 188: Which combination of lens materials inherently blocks UV radiation up to 400nm without requiring an additional UV coating or treatment?

High-index 1.74 and crown glass
Crown glass and CR-39 plastic
CR-39 plastic and high-index 1.67
Polycarbonate and Trivex (Correct answer)

Correct answer: Polycarbonate and Trivex

Both polycarbonate and Trivex contain UV absorbers within their molecular structure, providing inherent UV400 protection without any additional coating.

Question 189: Which cleaning method is recommended for lenses with an anti-reflective coating?

Clean with a fresh microfiber cloth and an appropriate lens-cleaning solution or water (Correct answer)
Rinse with very hot water to dissolve oils, then air dry without wiping
Dry wipe with disposable paper towels using firm pressure to remove debris
Use undiluted ammonia-based household glass cleaner for best results

Correct answer: Clean with a fresh microfiber cloth and an appropriate lens-cleaning solution or water

AR-coated lenses should be cleaned with a clean microfiber cloth and a lens-safe cleaning solution to avoid scratching the coating with abrasive materials or damaging it with harsh chemicals.

Question 190: An optician in a licensed state dispenses eyeglasses using a prescription that expired 2 years ago without the patient's knowledge. This action primarily violates:

State opticianry licensure law and the FTC Eyeglass Rule (Correct answer)
OSHA 29 CFR 1910.133
ANSI Z80.1 power tolerances
HIPAA privacy rules

Correct answer: State opticianry licensure law and the FTC Eyeglass Rule

Using an expired prescription without the patient's awareness violates both state licensure laws governing scope of practice and the FTC Eyeglass Rule's requirements for valid prescriptions.

Question 191: What is the minimum lens thickness required by ANSI Z80.1 for dress eyewear in most materials?

2.0 mm
3.0 mm
1.0 mm (Correct answer)
1.5 mm

Correct answer: 1.0 mm

ANSI Z80.1 requires a minimum center thickness of 1.0 mm for most dress eyewear lens materials (except glass, which is 2.0 mm).

Question 192: When converting a spectacle prescription of −3.00 DS to a contact lens power, which factor must be considered for prescriptions exceeding ±4.00 D?

Frame wrap angle
Vertex distance compensation (Correct answer)
Pupillary distance
Pantoscopic tilt

Correct answer: Vertex distance compensation

For prescriptions above ±4.00 D, the vertex distance must be accounted for when converting spectacle power to contact lens power, as the lens sits on the cornea.

Question 193: What word best describes the direction change of light as it moves from one medium to another?

Diffusion
Reflection
Refraction (Correct answer)
Retraction

Correct answer: Refraction

Refraction describes how light slows down and bends as it transitions from air, a medium with a low density, into clear glass or plastic, a media with a high density. The light will bend toward the normal when it travels from air through a denser medium, such a lens, due to the difference in surface velocities between the two media. Diffusion is the term used to describe how light is dispersed when it passes through an uneven surface. When light bounces off a smooth surface, it is said to reflect; the light will reflect at the same angle as when it first reaches the surface. When white light is refracted, dispersion occurs, dividing it into the colors red, orange, yellow, green, blue, and violet.

Question 194: An optician working in a state with mandatory licensure allows their license to lapse but continues to dispense eyeglasses. This constitutes:

Legal practice if supervised by a licensed optometrist
A permissible grace period activity
Unlicensed practice, which may be subject to civil and criminal penalties (Correct answer)
An administrative error corrected by paying a late fee retroactively

Correct answer: Unlicensed practice, which may be subject to civil and criminal penalties

Practicing opticianry with a lapsed license in a state that requires licensure is unlicensed practice and may result in civil fines, criminal charges, or both.

Question 195: What is the effect of increasing a lens's center thickness on its optical performance?

Increases the index of refraction
Increases back vertex power (Correct answer)
Decreases front vertex power
Has no effect on power

Correct answer: Increases back vertex power

Increasing center thickness increases the back vertex power of a plus lens due to the lens clock effect.

Question 196: An optician in a two-for-one sale advertises 'free lenses' with frame purchase but adds undisclosed charges later. Which regulatory body would most likely investigate this as a deceptive trade practice?

Department of Labor
Federal Trade Commission (FTC) (Correct answer)
State Board of Optometry
FDA

Correct answer: Federal Trade Commission (FTC)

The FTC enforces consumer protection laws against deceptive advertising and unfair trade practices in the optical retail industry.

Question 197: What is the function of a 'skull temple' (also called a 'library temple') on an eyeglass frame?

It extends straight back with no curve and is used primarily for reading glasses (Correct answer)
It is spring-loaded to grip the head firmly
It rests straight back over the ear with a slight curve at the tip for light retention
It wraps completely around the ear for maximum retention

Correct answer: It extends straight back with no curve and is used primarily for reading glasses

A skull (library) temple extends straight back with little to no downward bend, resting lightly on the ear and allowing glasses to be slipped on and off easily.

Question 198: When measuring the segment height for a patient being fitted with lined trifocal lenses, what is the correct anatomical reference point to use as the starting position for the measurement?

The lower margin of the pupil (Correct answer)
The limbus
The upper margin of the lower eyelid
The center of the pupil

Correct answer: The lower margin of the pupil

The standard fitting practice for lined trifocal lenses is to measure from the lower margin of the patient's pupil down to the deepest part of the lens eyewire. This placement ensures that the intermediate segment is positioned correctly for the patient's line of sight when they look down slightly for tasks like computer use, while also allowing access to the near segment below it.

Question 199: A patient presents with a base curve of 7.80 mm on their current contact lens and complains of lens tightness. What adjustment should be made?

Decrease the base curve to 7.60 mm
Increase the base curve to 8.00 mm (Correct answer)
Switch to a toric lens
Increase the lens diameter

Correct answer: Increase the base curve to 8.00 mm

A flatter (larger) base curve provides more movement and reduces the tight fit sensation.

Question 200: Under HIPAA, which of the following patient record activities requires explicit written authorization from the patient?

Sending records to a marketing firm for promotional use (Correct answer)
Disclosing records to the patient's insurance company for payment
Sharing records with another treating provider
Providing records during a state board audit

Correct answer: Sending records to a marketing firm for promotional use

HIPAA requires written patient authorization for uses of protected health information for marketing purposes, as this is not a treatment, payment, or operations activity.

Question 201: What is Aphakia?

The presence of a refractive error
The absence of the crystalline lens (Correct answer)
The absence of accommodation
The presence of a cataract

Correct answer: The absence of the crystalline lens

Aphakia is the medical term for the crystalline lens' absence. This disorder may be inherited or brought on by an injury. During cataract surgery, an ophthalmologist will often remove the crystalline lens and replace it with an artificial lens to correct vision. The reduced ability of the eyes to focus while changing distances is referred to as accommodation. The crystalline lens may be removed during cataract surgery if a cataract or refractive defect is present, although this is not a requirement for the diagnosis of aphakia.

Question 202: The FDA-approved maximum continuous (extended) wear period for silicone hydrogel contact lenses approved for extended wear is:

30 days / 29 nights (Correct answer)
7 days / 6 nights
3 days / 2 nights
60 days / 59 nights

Correct answer: 30 days / 29 nights

Certain silicone hydrogel contact lenses are FDA-approved for up to 30 consecutive days of continuous (extended) wear, though practitioners often recommend shorter intervals for safety.

NOCE (National Opticianry Competency Exam)

The NOCE (National Opticianry Competency Exam) exam validates essential knowledge and skills required for certification or licensure in this field.

200

Questions

150 min

Time Limit

70%

To Pass

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