Certified Orthoptist (CO) Certification Exam — Questions and Answers

Question 1: The Edinger-Westphal nucleus provides parasympathetic innervation to which intraocular structures?

Lateral rectus and sphincter pupillae
Dilator pupillae and superior rectus
Ciliary muscle and superior oblique
Sphincter pupillae and ciliary muscle (Correct answer)

Correct answer: Sphincter pupillae and ciliary muscle

The Edinger-Westphal nucleus provides parasympathetic innervation via CN III to both the sphincter pupillae (pupil constriction) and the ciliary muscle (accommodation).

Question 2: The principle of non-maleficence most directly applies when an orthotist considers:

How to market services to increase patient volume
Whether the risks of a proposed device or treatment could harm the patient (Correct answer)
Whether to accept a new insurance contract
When to schedule follow-up appointments

Correct answer: Whether the risks of a proposed device or treatment could harm the patient

Non-maleficence requires practitioners to evaluate whether proposed treatments could cause harm before proceeding.

Question 3: When performing retinoscopy, a 'with' motion of the reflex indicates which refractive state?

Astigmatism only
Hyperopia or myopia less than working distance (Correct answer)
Emmetropia exactly
Myopia beyond the far point

Correct answer: Hyperopia or myopia less than working distance

A 'with' motion in retinoscopy occurs when the patient's far point is beyond the examiner, indicating hyperopia or myopia less than the working distance correction.

Question 4: Which clinical test can differentiate a true Brown syndrome from an inferior oblique palsy?

Worth 4-dot test at near
Maddox rod at 6 m
Cover-uncover test in primary position
Forced duction test in the field of the inferior oblique (Correct answer)

Correct answer: Forced duction test in the field of the inferior oblique

In Brown syndrome, forced duction is positive (restriction) in the superotemporal direction; in IO palsy, forced duction is negative.

Question 5: In orthotics practice, when is hepatitis B vaccination MOST relevant as an infection control measure?

Only for orthotists who work in surgical settings
Only after a confirmed needlestick injury
For all orthotists with occupational exposure to blood or body fluids (Correct answer)
Only for staff working with pediatric patients

Correct answer: For all orthotists with occupational exposure to blood or body fluids

OSHA requires employers to offer hepatitis B vaccination to all employees with occupational exposure to blood or other potentially infectious materials.

Question 6: When measuring fusional vergence amplitudes with a prism bar, you record the 'break' point as:

When the patient first reports slight blurring
When the patient completes 10 seconds of comfortable fusion
When the deviation is neutralized on cover test
When the patient reports diplopia or one eye is seen to deviate (Correct answer)

Correct answer: When the patient reports diplopia or one eye is seen to deviate

The break point is defined as the prism power at which the patient first reports diplopia or the examiner observes a manifest deviation.

Question 7: What is a near-miss report in CO practice?

A near break-even report
Documentation of an event that could have caused harm but did not (Correct answer)
An employee near target
A project near deadline

Correct answer: Documentation of an event that could have caused harm but did not

Near-miss reports document events where harm almost occurred, providing data to prevent future incidents.

Question 8: When developing a treatment protocol for a patient with diabetic peripheral neuropathy, which consideration is MOST critical?

Pressure distribution and skin integrity (Correct answer)
Maximizing ambulation speed
Reducing orthotic weight to minimum
Achieving maximum joint ROM

Correct answer: Pressure distribution and skin integrity

Patients with diabetic neuropathy have impaired sensation, making pressure distribution and prevention of skin breakdown the paramount orthotic concern.

Question 9: Which of the following best describes 'addendum' documentation in an orthotic medical record?

A correction made using white-out on a paper record
A summary note written before the patient encounter
Additional information added to a previously completed note, clearly marked with the date and time of addition (Correct answer)
A note written to replace an incorrect note

Correct answer: Additional information added to a previously completed note, clearly marked with the date and time of addition

An addendum is a clearly dated and timed addition to a completed note that provides missing information without altering the original entry.

Question 10: During an orthotic fitting, a patient who uses anticoagulant medication develops uncontrolled bleeding from a small skin abrasion. What first aid measure is most appropriate?

Apply a tourniquet immediately above the wound
Apply firm, direct pressure with a clean dressing and elevate the limb (Correct answer)
Apply ice only and wait for natural clotting
Flush with hydrogen peroxide and leave the wound uncovered to clot

Correct answer: Apply firm, direct pressure with a clean dressing and elevate the limb

Direct pressure and elevation are the first-line interventions for controlling bleeding; tourniquets are reserved for life-threatening limb hemorrhage that cannot be controlled otherwise.

Question 11: When measuring and documenting a patient's residual limb for a prosthetic-orthotic interface, what measurement should always be included in the record?

The color of the patient's skin
The patient's height and weight only
Circumferential measurements at standardized anatomical landmarks with corresponding distances from the reference point (Correct answer)
The patient's shoe size

Correct answer: Circumferential measurements at standardized anatomical landmarks with corresponding distances from the reference point

Circumferential measurements at defined anatomical landmarks with distances from a reference point provide reproducible data for fabrication and future comparison.

Question 12: A custom spinal orthosis is ordered for a geriatric patient with moderate dementia who cannot consistently follow safety instructions. What additional risk management step is MOST appropriate?

Simplify the orthosis design only; cognitive status does not require additional intervention
Involve the patient's legal caregiver or surrogate in all education and establish a supervised donning protocol (Correct answer)
Substitute a prefabricated device to reduce complexity
Limit orthosis use to clinic visits only

Correct answer: Involve the patient's legal caregiver or surrogate in all education and establish a supervised donning protocol

Cognitive impairment requires engaging the legal caregiver or surrogate decision-maker and establishing supervised protocols to ensure the device is used safely and consistently.

Question 13: Which extraocular muscle is responsible for primary abduction of the eye?

Inferior oblique
Superior oblique
Lateral rectus (Correct answer)
Medial rectus

Correct answer: Lateral rectus

The lateral rectus, innervated by cranial nerve VI (abducens), is the primary abductor of the eye.

Question 14: A patient with T6 complete spinal cord injury wants to use long leg braces for therapeutic standing. Which is the MOST important criterion when developing this treatment plan?

Patient's cosmetic preference for brace style
Ability to control knee flexion actively
Adequate upper extremity strength for support and transfers (Correct answer)
Complete absence of lower extremity spasticity

Correct answer: Adequate upper extremity strength for support and transfers

Functional use of HKAFOs requires sufficient upper extremity strength to manage crutch ambulation, weight shifts, and donning/doffing of the orthoses.

Question 15: A patient with idiopathic scoliosis (Cobb angle 28°, Risser 2) presents for orthotic management. Which brace and wearing protocol is standard of care?

Charleston Bending Brace, worn 23 hours/day
Boston TLSO or equivalent, worn 16-23 hours/day (Correct answer)
Boston TLSO, worn 8 hours/day (nighttime only)
Rigid cervicothoracic orthosis, worn full-time

Correct answer: Boston TLSO or equivalent, worn 16-23 hours/day

Evidence-based guidelines (SRS/POSNA) recommend a rigid TLSO worn 16-23 hours per day to halt curve progression during the adolescent growth phase.

Question 16: Which of the following best defines informed consent?

A verbal agreement with the doctor
Consent obtained from insurance providers
A witness signature for patient procedures
Patient's understanding and voluntary agreement to treatment (Correct answer)

Correct answer: Patient's understanding and voluntary agreement to treatment

Informed consent is a crucial ethical and legal process where a patient receives all necessary information about a proposed treatment or procedure, including its risks, benefits, alternatives, and prognosis. The patient must then voluntarily agree to the treatment after fully understanding this information, demonstrating their autonomy in healthcare decisions.

Question 17: During the cover-uncover test, the covered eye moves outward when uncovered. This indicates:

Hypertropia
Esotropia (Correct answer)
Hypotropia
Exotropia

Correct answer: Esotropia

An outward refixation movement on uncovering means the eye was deviated inward (esotropia) under the cover.

Question 18: A patient with multiple sclerosis has foot drop that worsens significantly with fatigue later in the day. Which treatment planning approach best accommodates this fluctuating presentation?

KAFO to provide maximum stability throughout the day
No orthotic intervention as symptoms are variable
Functional electrical stimulation (FES) or energy-storing AFO trialed with fatigue in mind (Correct answer)
Permanent solid AFO worn continuously

Correct answer: Functional electrical stimulation (FES) or energy-storing AFO trialed with fatigue in mind

MS fatigue-related foot drop responds well to FES or lightweight energy-storing AFOs that address the deficit without increasing metabolic cost during already-taxing activities.

Question 19: Visual evoked potentials (VEPs) measure the electrical response generated primarily by which structure?

Lateral geniculate nucleus
Primary visual cortex (V1) (Correct answer)
Superior colliculus
Retinal ganglion cells

Correct answer: Primary visual cortex (V1)

Pattern VEPs record the cortical electrical response to structured visual stimuli and reflect the integrity of the entire visual pathway to the primary visual cortex.

Question 20: The AC/A ratio is calculated using the gradient method by comparing the deviation with and without:

A synoptophore arm adjustment
A prism placed before each eye alternately
A defined lens power (typically +3.00 or -3.00 D) in place (Correct answer)
An occluder alternated rapidly

Correct answer: A defined lens power (typically +3.00 or -3.00 D) in place

The gradient AC/A uses lenses to stimulate accommodation and measures the resulting change in deviation; ratio = change in deviation (PD) ÷ lens power (D).

Question 21: What tool is typically used to assess near visual acuity in a clinical setting?

Visual field perimeter
Jaeger chart (Correct answer)
Snellen chart
Ishihara plates

Correct answer: Jaeger chart

The Jaeger chart is a common tool used to measure near visual acuity, typically held at a standard reading distance (e.g., 14 inches). It consists of paragraphs of text or numbers in various print sizes, allowing for assessment of a patient's ability to see fine details up close, which is crucial for tasks like reading.

Question 22: What is the most important reason for an orthotist to maintain accurate, contemporaneous clinical documentation?

To document adherence to manufacturer fitting guidelines
To track inventory of materials used per patient
To support continuity of care, legal defensibility, and appropriate billing (Correct answer)
To satisfy accreditation requirements only

Correct answer: To support continuity of care, legal defensibility, and appropriate billing

Contemporaneous documentation supports clinical decision-making, provides a legal record of care rendered, ensures continuity between providers, and substantiates reimbursement claims.

Question 23: What is peer review in CO Patient Assessment & Evaluation?

Reducing workloads
Quality evaluation by qualified colleagues for improvement (Correct answer)
Determining promotions
Creating competition

Correct answer: Quality evaluation by qualified colleagues for improvement

Peer review provides objective assessment by qualified professionals to identify improvements and ensure accountability.

Question 24: A patient with a history of latex allergy is being fitted for a silicone suspension liner. The orthotist should FIRST:

Substitute a thermoplastic material regardless of fit considerations
Confirm with the manufacturer that the liner contains no latex or latex-derived components (Correct answer)
Apply a fabric sock barrier before applying the liner
Proceed since silicone is latex-free

Correct answer: Confirm with the manufacturer that the liner contains no latex or latex-derived components

Even products marketed as latex-free may contain trace latex components or cross-reactive proteins; verifying with the manufacturer is essential before using any product on a latex-allergic patient.

Question 25: An orthotist is fitting a functional electrical stimulation (FES) orthosis on a patient with a pacemaker. Which statement is correct regarding this situation?

Electrical stimulation is contraindicated without clearance from the patient's cardiologist (Correct answer)
FES is safe with all modern pacemakers
FES can be used if electrodes are placed distal to the pacemaker site
Low-frequency FES is universally safe for pacemaker patients

Correct answer: Electrical stimulation is contraindicated without clearance from the patient's cardiologist

FES and other electrical stimulation devices can interfere with pacemaker function and require explicit cardiologist clearance before use in any patient with a pacemaker or implantable cardiac device.

Question 26: When assessing a patient with foot drop, which gait deviation is most commonly observed?

Antalgic gait
Scissor gait
Steppage gait (Correct answer)
Trendelenburg gait

Correct answer: Steppage gait

Steppage gait occurs when the patient excessively flexes the hip and knee to clear the foot during swing phase due to weak dorsiflexors.

Question 27: On the Hirschberg test, a corneal light reflex displaced 1 mm nasally in the left eye corresponds to approximately how many prism diopters of left exotropia?

22 prism diopters
15 prism diopters (Correct answer)
30 prism diopters
7 prism diopters

Correct answer: 15 prism diopters

Each 1 mm of corneal reflex displacement corresponds to approximately 15 prism diopters (or 7°) of deviation.

Question 28: What is a needs assessment in CO Infection Control & Prevention practice?

Benefits survey
Identifying gaps between current conditions and desired outcomes (Correct answer)
Office supply list
Property appraisal

Correct answer: Identifying gaps between current conditions and desired outcomes

A needs assessment identifies gaps between current performance and desired outcomes to justify improvements.

Question 29: The Krimsky test is used to measure:

Accommodative convergence/accommodation ratio
Fusional vergence amplitudes
Stereoacuity at near
Angle of deviation using prisms and the corneal light reflex (Correct answer)

Correct answer: Angle of deviation using prisms and the corneal light reflex

The Krimsky test measures the angle of strabismus by centering the corneal light reflex with a prism placed over the deviating eye.

Question 30: A slit lamp biomicroscope allows examination of the anterior segment using which illumination technique to assess corneal edema?

Retroillumination
Direct focal illumination
Sclerotic scatter
Specular reflection (Correct answer)

Correct answer: Specular reflection

Specular reflection from the corneal endothelium reveals cell density and morphology, and disturbance of this pattern indicates corneal edema.

Question 31: The critical period for amblyopia treatment, during which the visual cortex remains most plastic, is generally considered to end at approximately:

Age 18 years
Age 7-8 years (Correct answer)
Age 12 years
Age 3 years

Correct answer: Age 7-8 years

The visual cortex is most plastic during early childhood, with the critical period closing around age 7-8, though some plasticity persists into adolescence.

Question 32: What is a CO professional's obligation regarding confidentiality?

Discussing cases with family
Using as marketing material
Sharing freely with other professionals
Protecting client information and disclosing only with authorization or legal requirement (Correct answer)

Correct answer: Protecting client information and disclosing only with authorization or legal requirement

Confidentiality requires protecting all client information from unauthorized disclosure, sharing only with consent or legal mandate.

Question 33: What is evidence-based practice in CO Patient Assessment & Evaluation?

Doing whatever clients request
Integrating research evidence with expertise and client needs (Correct answer)
Following intuition only
Using newest unproven methods

Correct answer: Integrating research evidence with expertise and client needs

Evidence-based practice combines research, expertise, and client preferences for optimal outcomes.

Question 34: A pediatric patient with cerebral palsy who uses a KAFO has a seizure in the clinic. What is the most appropriate immediate action?

Clear the area of hazards and protect the head; do not restrain (Correct answer)
Restrain the patient's limbs to prevent injury
Remove the KAFO immediately during the seizure
Insert a tongue depressor to prevent tongue biting

Correct answer: Clear the area of hazards and protect the head; do not restrain

During a seizure, the caregiver should clear the surrounding area and cushion the head while never restraining the patient or placing objects in the mouth.

Question 35: Which of the following is a symptom of poor binocular vision?

Irritation from contact lenses
Headache during reading (Correct answer)
Blurry peripheral vision
Eye twitching

Correct answer: Headache during reading

Poor binocular vision, such as from convergence insufficiency or uncorrected phorias, often causes symptoms related to eye strain and the effort to maintain single vision. Headaches, especially during prolonged near tasks like reading, are a classic symptom as the eyes struggle to work together efficiently. Other options like eye twitching or blurry peripheral vision are not typically primary symptoms of poor binocular vision.

Question 36: Under HIPAA, a patient requests their orthotic medical records. The orthotist must provide the records within how many days?

30 days (with one possible 30-day extension) (Correct answer)
60 days
10 days
90 days

Correct answer: 30 days (with one possible 30-day extension)

HIPAA requires covered entities to provide patients access to their records within 30 days, with one permitted 30-day extension if needed.

Question 37: Which of the following is considered a clinical procedure in orthoptics?

Skin allergy testing
Alternate cover test (Correct answer)
Auscultation of chest sounds
Tympanic temperature reading

Correct answer: Alternate cover test

The alternate cover test is a fundamental orthoptic procedure used to detect and measure the presence and magnitude of a tropia (manifest deviation) or phoria (latent deviation) of the eyes. It directly assesses ocular alignment and binocular vision, making it a core clinical skill for orthoptists.

Question 38: Under the principle of justice in healthcare ethics, an orthotist is obligated to:

Treat only patients with the best insurance coverage
Provide fair and equitable care regardless of a patient's socioeconomic status (Correct answer)
Prioritize patients based on their likelihood of a good outcome
Charge higher fees to patients without a referral

Correct answer: Provide fair and equitable care regardless of a patient's socioeconomic status

Justice requires equitable distribution of care and resources without discrimination based on socioeconomic or personal factors.

Question 39: A right CN IV palsy typically causes the right eye to be:

Exotropic and hypotropic
Esotropic with an upgaze limitation
Hypertropic, with the head tilted to the right
Hypertropic, with compensatory head tilt to the left (Correct answer)

Correct answer: Hypertropic, with compensatory head tilt to the left

A right CN IV palsy causes right hypertropia; the patient tilts the head to the left (away from the affected side) to reduce diplopia.

Question 40: A patient with a bilateral lower extremity orthosis develops signs of deep vein thrombosis (calf pain, redness, and swelling) in the right leg. What is the most appropriate orthotist response?

Immediately refer the patient to emergency medical services or the physician (Correct answer)
Remove the orthosis and recommend the patient rest at home
Massage the calf to reduce swelling and adjust the orthosis
Apply compression bandaging and schedule follow-up in one week

Correct answer: Immediately refer the patient to emergency medical services or the physician

Suspected DVT is a medical emergency because of the risk of pulmonary embolism; the patient must be referred immediately to a physician or emergency care.

Question 41: During a clinical encounter, an interpreter is needed for a non-English-speaking patient. Which interpreter arrangement is LEAST appropriate?

Trained in-person hospital interpreter
Certified medical interpreter via video remote service
The patient's 8-year-old child (Correct answer)
A certified telephone interpreter service

Correct answer: The patient's 8-year-old child

Using minor children as interpreters is inappropriate because it burdens the child, compromises accuracy, and violates privacy by exposing minors to adult medical details.

Question 42: Diuretics prescribed for hypertension can cause electrolyte imbalances. Which electrolyte abnormality MOST directly affects neuromuscular function relevant to orthotic patients?

Hyperphosphatemia causing joint stiffness
Hypokalemia causing muscle weakness and cramps (Correct answer)
Hypernatremia causing water retention in muscle tissue
Hypercalcemia causing pathological fractures

Correct answer: Hypokalemia causing muscle weakness and cramps

Diuretic-induced hypokalemia causes muscle weakness and cramping, directly impacting a patient's ambulatory function and the effectiveness of prescribed orthotics.

Question 43: Which type of esotropia is characterized by a deviation that is controlled by accommodation and fully corrected with the hyperopic glasses prescription?

Infantile esotropia
Fully accommodative esotropia (Correct answer)
Basic esotropia
Partially accommodative esotropia

Correct answer: Fully accommodative esotropia

Fully accommodative esotropia is completely corrected by the full cycloplegic hyperopic prescription, eliminating the deviation without surgery.

Question 44: Which of the following best describes the orthotist's role in a patient's discharge planning process following an inpatient hospital stay?

Coordinating all outpatient therapy services post-discharge
Providing medical clearance for return to work
Prescribing the appropriate orthosis based on the patient's diagnosis
Ensuring the patient and caregiver can safely manage the orthosis in the home environment before discharge (Correct answer)

Correct answer: Ensuring the patient and caregiver can safely manage the orthosis in the home environment before discharge

The orthotist's discharge role centers on patient and caregiver education to ensure safe, independent management of the device at home, including donning, doffing, skin inspection, and emergency contacts.

Question 45: When performing plaster casting, which PPE element specifically protects the orthotist from splatter containing bloodborne pathogens?

Surgical cap
N95 respirator
Latex gloves
Face shield or goggles (Correct answer)

Correct answer: Face shield or goggles

Face shields or goggles protect mucous membranes of the eyes from splatter that may contain bloodborne pathogens.

Question 46: In the context of orthotic practice, a 'near miss' event is best defined as:

A device failure that causes minor patient injury
A billing error that was later corrected
An error that could have caused harm but was caught before reaching the patient (Correct answer)
An incident where the patient nearly fell while wearing an orthosis

Correct answer: An error that could have caused harm but was caught before reaching the patient

A near miss is an unplanned event that did not result in patient harm but had the potential to do so; reporting near misses enables process improvements that prevent future adverse events.

Question 47: A patient with a transtibial prosthesis residual limb develops signs of severe infection (redness, warmth, swelling, fever). What is the correct orthotist response?

Apply an antiseptic dressing and continue use of the device
Refer immediately to the prescribing physician or emergency care (Correct answer)
Adjust the socket fit and schedule a follow-up in two weeks
Recommend over-the-counter antibiotics and monitor at home

Correct answer: Refer immediately to the prescribing physician or emergency care

Signs of systemic infection or serious local infection require immediate medical referral because delayed treatment can lead to sepsis or tissue loss.

Question 48: The minimum federal requirement for retention of adult patient medical records under Medicare is:

5 years from date of service (Correct answer)
3 years from date of service
7 years from date of service
10 years from date of service

Correct answer: 5 years from date of service

Medicare requires suppliers and providers to retain records for a minimum of 5 years from the date of service, though some states require longer retention periods.

Question 49: The Bagolini striated lens test is used to evaluate which aspect of binocular vision?

Distance stereoacuity
Accommodative convergence ratio
Retinal correspondence and suppression (Correct answer)
Intraocular pressure

Correct answer: Retinal correspondence and suppression

Bagolini striated lenses test retinal correspondence and suppression under near-natural viewing conditions by creating streak images from a point source.

Question 50: A newly hired orthotics technician accidentally applies an incorrect thermoplastic material, resulting in a device that cannot withstand the patient's body weight. This represents which type of quality failure?

Scope of practice violation
Administrative failure
Documentation error
Material substitution error — a process failure in fabrication quality control (Correct answer)

Correct answer: Material substitution error — a process failure in fabrication quality control

Using an incorrect material due to inadequate verification is a process failure in the fabrication quality control system that can result in device failure and patient injury.

Question 51: Which cleaning step must ALWAYS be performed before disinfecting an orthotic device or work surface?

Applying the disinfectant at double concentration
Rinsing with sterile water
Removing gross soil and debris with soap and water or detergent (Correct answer)
Drying thoroughly with a sterile towel

Correct answer: Removing gross soil and debris with soap and water or detergent

Organic matter inactivates many disinfectants, so removing gross soil first is essential for disinfection to be effective.

Question 52: In the treatment protocol for a patient with a distal radius fracture managed conservatively, when is it appropriate to transition from a wrist immobilization splint to a functional orthosis?

Not until 6 months post-injury
After radiographic evidence of healing (typically 6-8 weeks) (Correct answer)
Only after complete restoration of grip strength
Immediately after injury to prevent pain

Correct answer: After radiographic evidence of healing (typically 6-8 weeks)

Transition to a functional orthosis occurs after radiographic confirmation of fracture healing, typically at 6-8 weeks, allowing progressive mobilization while protecting the wrist.

Question 53: A pediatric patient is referred for scoliosis bracing with a Cobb angle of 28 degrees and is determined to be a Risser grade 1. This combination suggests:

Significant remaining growth potential; bracing is typically indicated (Correct answer)
Surgical referral is immediately required
Skeletal maturity is near complete; bracing is unlikely to help
Observation only is indicated; brace at 40 degrees

Correct answer: Significant remaining growth potential; bracing is typically indicated

Risser grade 1 indicates early skeletal maturity with significant growth remaining, making this patient an ideal candidate for orthotic bracing to halt curve progression.

Question 54: Which documentation element is required to support a claim for a custom-fabricated orthosis versus a prefabricated device?

A statement that the custom device looks better
A note that the prefabricated device was in stock
Documentation that a prefabricated device would not meet the patient's unique clinical needs due to specific anatomical or functional characteristics (Correct answer)
Evidence that the custom device was cheaper

Correct answer: Documentation that a prefabricated device would not meet the patient's unique clinical needs due to specific anatomical or functional characteristics

To justify custom fabrication over a prefabricated device, documentation must clearly state why a prefabricated option was clinically insufficient for that patient.

Question 55: What is the best practice when documenting patient information?

Use abbreviations only
Record information accurately and immediately (Correct answer)
Wait until the end of the week to document
Rely on memory for later entries

Correct answer: Record information accurately and immediately

Accurate and immediate documentation is critical in healthcare for patient safety, continuity of care, and legal reasons. Recording information promptly ensures that details are not forgotten or misinterpreted, provides an up-to-date record for all healthcare providers, and supports evidence-based decision-making.

Question 56: The cover-uncover test specifically detects:

Manifest strabismus (tropia) (Correct answer)
Latent deviation (phoria)
Stereoacuity loss
Suppression depth

Correct answer: Manifest strabismus (tropia)

The cover-uncover test detects manifest strabismus (tropia) by observing movement of the uncovered eye when the fellow eye is covered.

Question 57: What does professional competency require of a CO practitioner?

Maintaining current knowledge through continuing education (Correct answer)
Learning only during initial schooling
Accepting all work regardless of qualifications
Relying solely on original training

Correct answer: Maintaining current knowledge through continuing education

Professional competency requires ongoing education, staying current with developments, and practicing only within qualified areas.

Question 58: A patient signs an informed consent form but later claims they did not understand the risks. This situation highlights the importance of:

Ensuring the patient demonstrates comprehension, not just signature (Correct answer)
Obtaining consent only from licensed physicians
Filing consent forms in a location inaccessible to patients
Using only legal boilerplate language in consent forms

Correct answer: Ensuring the patient demonstrates comprehension, not just signature

True informed consent requires confirmed patient understanding of risks and benefits, not merely a signature on a document.

Question 59: What is the primary purpose of a Letter of Medical Necessity (LMN) in orthotic practice?

To bill the patient directly for services rendered
To transfer care from one orthotist to another
To document why a specific orthotic device is medically required for a particular patient (Correct answer)
To report adverse outcomes to the state board

Correct answer: To document why a specific orthotic device is medically required for a particular patient

An LMN explains the clinical rationale for an orthotic device, linking the patient's diagnosis and functional deficits to the prescribed device.

Question 60: The vestibulo-ocular reflex (VOR) functions primarily to maintain what?

Stable retinal images during head movement (Correct answer)
Accurate smooth pursuit eye movements
Binocular fusion during near work
Correct vergence alignment

Correct answer: Stable retinal images during head movement

The vestibulo-ocular reflex stabilizes retinal images during head movement by generating compensatory eye movements equal and opposite to head rotation.

Question 61: A teenager discloses to you confidentially that they are being bullied but denies self-harm ideation. Your ethical obligation includes:

Maintain complete confidentiality as the patient is a minor
Document the disclosure, provide crisis resources, and discuss with the supervising physician about reporting obligations (Correct answer)
Breach confidentiality immediately and call police
Ignore the disclosure as it is outside orthoptic scope

Correct answer: Document the disclosure, provide crisis resources, and discuss with the supervising physician about reporting obligations

While strict confidentiality applies absent imminent harm, best practice requires documentation, providing support resources, and multidisciplinary consultation.

Question 62: Which instrument measures stereoacuity using random dot patterns without monocular cues?

Titmus fly test
Lang stereotest
Frisby test
TNO test (Correct answer)

Correct answer: TNO test

The TNO test uses random-dot anaglyphic plates that eliminate all monocular cues, making it a true test of stereoscopic depth perception.

Question 63: The Maddox rod test dissociates the eyes by:

Polarizing light differently for each eye
Converting a point light source into a streak seen only by one eye (Correct answer)
Occluding one eye with an opaque paddle
Introducing a vertical prism before one eye

Correct answer: Converting a point light source into a streak seen only by one eye

The grooved glass converts the white dot of light into a red streak, preventing fusion and revealing the phoria.

Question 64: Which neonatal ocular condition can cause permanent severe vision loss if not treated within the first weeks of life?

Congenital cataracts (Correct answer)
Physiologic neonatal esotropia
Retinopathy of prematurity stage 1
Congenital nasolacrimal duct obstruction

Correct answer: Congenital cataracts

Congenital cataracts cause visual deprivation amblyopia and must be treated within the first weeks of life to prevent permanent, severe vision loss.

Question 65: Which of the following best describes the function of the superior cervical ganglion in ocular physiology?

Sympathetic innervation to the dilator pupillae and Müller's muscle (Correct answer)
Parasympathetic innervation to the ciliary muscle
Sensory innervation to the cornea
Motor innervation to the orbicularis oculi

Correct answer: Sympathetic innervation to the dilator pupillae and Müller's muscle

The superior cervical ganglion provides sympathetic postganglionic fibers that innervate the dilator pupillae (pupil dilation) and Müller's muscle (upper lid elevation).

Question 66: In orthoptic management of accommodative esotropia, bifocal or progressive addition lenses are prescribed to:

Increase accommodative effort
Reduce near accommodative demand and the associated convergence excess (Correct answer)
Stimulate the amblyopic eye
Correct anisometropia

Correct answer: Reduce near accommodative demand and the associated convergence excess

Bifocal or progressive addition lenses reduce near accommodative demand in patients with accommodative esotropia, lessening the convergence excess that drives the near deviation.

Question 67: When applying a total-contact cast to a patient with a diabetic foot ulcer, which precaution is MOST important to prevent cross-infection?

Wearing an N95 respirator throughout
Using sterile casting materials exclusively
Performing hand hygiene before and after the procedure (Correct answer)
Placing the patient in a negative-pressure room

Correct answer: Performing hand hygiene before and after the procedure

Hand hygiene before and after patient contact is the single most important practice for preventing cross-infection in clinical settings.

Question 68: A minor patient (age 14) wants their diagnosis kept from their parents. In most US states, what governs disclosure of routine orthoptic findings?

The minor has full autonomy over all medical records
The orthoptist alone decides disclosure
Parents or legal guardians retain the right to access minor children's medical records unless specific exceptions apply (Correct answer)
HIPAA prohibits all parental access to minor records

Correct answer: Parents or legal guardians retain the right to access minor children's medical records unless specific exceptions apply

In the US, parents generally have access to their minor child's records; HIPAA defers to state law, with limited exceptions for emancipated minors or specific sensitive services.

Question 69: Which feature best differentiates optic neuritis from anterior ischemic optic neuropathy (AION) in an acute presentation?

Reduced visual acuity
Presence of visual field defect
Pain with eye movement present in optic neuritis but not AION (Correct answer)
Disc swelling on funduscopy

Correct answer: Pain with eye movement present in optic neuritis but not AION

Periocular pain that worsens with eye movement is characteristic of optic neuritis (inflammatory) and is typically absent in AION (ischemic).

Question 70: Which informed consent element is MOST critical before performing a Worth 4-Dot test on a pediatric patient?

Consent from both parents simultaneously
Explanation of the test purpose to the child in age-appropriate language (Correct answer)
Genetic history disclosure
Written consent signed by the patient

Correct answer: Explanation of the test purpose to the child in age-appropriate language

Assent from the child with parental consent requires explaining the procedure in developmentally appropriate terms to maximize cooperation.

Question 71: The Frisby stereotest differs from polarized or anaglyphic stereotests because it:

Uses real depth without any glasses (Correct answer)
Only tests peripheral stereopsis
Measures stereoacuity in arc minutes
Requires special glasses for viewing

Correct answer: Uses real depth without any glasses

The Frisby test presents real physical depth differences using transparent plates of different thicknesses, requiring no special glasses.

Question 72: How should an orthoptist respond if a pediatric patient is uncooperative during an exam?

Reschedule the exam immediately
Use reassuring language and involve the parent (Correct answer)
Force the test quickly
Ignore the child’s discomfort

Correct answer: Use reassuring language and involve the parent

Pediatric patients can often be anxious or uncooperative during medical exams. An orthoptist should approach the situation with patience and empathy, using reassuring language to calm the child and involving the parent or guardian to help facilitate cooperation and comfort. This approach builds trust and often leads to a more successful examination.

Question 73: A patient in your waiting room collapses and becomes unresponsive. As a healthcare professional, your FIRST action should be:

Document the incident before acting
Call the ophthalmologist to assess ocular injuries
Activate the emergency response system and begin CPR if no pulse (Correct answer)
Ask bystanders to move the patient outside

Correct answer: Activate the emergency response system and begin CPR if no pulse

Activation of emergency services and initiation of CPR per BLS protocol takes priority in any cardiac or respiratory arrest situation.

Question 74: An orthotist notices a patient's custom foot orthosis has visible mold growth. What is the FIRST action to take?

Soak in dilute bleach for 10 minutes then refit
Sterilize the device in an autoclave
Wipe with 70% isopropyl alcohol and return to patient
Quarantine the device and assess it for disposal (Correct answer)

Correct answer: Quarantine the device and assess it for disposal

Visibly contaminated devices should be quarantined and evaluated for disposal before considering any reprocessing.

Question 75: A patient with vancomycin-resistant Enterococcus (VRE) is receiving orthotic care. Which precaution category applies?

Droplet precautions
Standard precautions only
Airborne precautions
Contact precautions (Correct answer)

Correct answer: Contact precautions

VRE is transmitted primarily through direct contact; contact precautions (gloves and gown) are required in addition to standard precautions.

Question 76: When assessing skin integrity prior to fitting a patient with a total contact cast (TCC), which skin condition is a relative contraindication?

Mild xerosis (dry skin) on the dorsum
Shallow grade 1 pressure ulcer on the heel
Active cellulitis with induration and warmth (Correct answer)
Superficial maceration between toes

Correct answer: Active cellulitis with induration and warmth

Active cellulitis with induration requires antibiotic treatment before total contact casting to avoid sealing in an active infection.

Question 77: What is suppression in binocular vision assessment?

Dominance of one eye
Brain ignores input from one eye (Correct answer)
Visual signal blocked by retina
Focusing delay in one eye

Correct answer: Brain ignores input from one eye

Suppression in binocular vision refers to the brain's active mechanism of ignoring or 'turning off' the visual input from one eye. This occurs to avoid diplopia (double vision) when the eyes are misaligned (strabismus) or when there is a significant difference in image quality between the two eyes. While it prevents double vision, prolonged suppression can lead to amblyopia.

Question 78: The Farnsworth-Munsell 100-hue test evaluates:

Stereoacuity at distance and near
Brightness comparison between the two eyes
Contrast sensitivity across spatial frequencies
Color discrimination ability across the entire hue circle (Correct answer)

Correct answer: Color discrimination ability across the entire hue circle

The FM 100-hue test assesses the ability to arrange colored caps in chromatic order across the full hue circle, detecting subtle color discrimination deficits.

Question 79: What tool is commonly used to measure eye deviations in prism diopters?

Prism bar (Correct answer)
Slit lamp
Phoropter
Ophthalmoscope

Correct answer: Prism bar

A prism bar is a diagnostic tool consisting of a series of prisms of increasing dioptric power, mounted in a linear fashion. It is commonly used in orthoptics to measure the magnitude of eye deviations (strabismus) and fusional vergence amplitudes, quantifying them in prism diopters. Other tools like the slit lamp, ophthalmoscope, and phoropter serve different diagnostic purposes.

Question 80: The 4-prism diopter base-out test is used to detect:

Central suppression scotoma (Correct answer)
Fusional vergence range
Angle kappa
Stereoblindness in adults

Correct answer: Central suppression scotoma

A 4 PD base-out prism placed before one eye normally induces a versional movement; absence of the expected refixation indicates a central suppression scotoma.

Question 81: Which piece of information is most important to document after every orthotic device delivery appointment?

The name of the delivery courier
That the device was delivered, fit was assessed, patient education was provided, and patient demonstrated independence with donning/doffing (Correct answer)
The retail price of competing devices considered
The patient's shoe size and brand preference

Correct answer: That the device was delivered, fit was assessed, patient education was provided, and patient demonstrated independence with donning/doffing

Delivery documentation must confirm device receipt, fit assessment, patient education, and functional independence with the device to satisfy clinical and payer requirements.

Question 82: What does the acronym RICE stand for in musculoskeletal injury first aid?

Reduce swelling, Ice pack, Cast, Exercise
Rest, Ice, Compression, Elevation (Correct answer)
Rest, Immobilize, Circulation check, Elevate
Reduce, Immobilize, Cool, Evaluate

Correct answer: Rest, Ice, Compression, Elevation

RICE (Rest, Ice, Compression, Elevation) is the standard first aid protocol for soft tissue injuries such as sprains and strains.

Question 83: What role do standard operating procedures play in CO Patient Assessment & Evaluation?

Creating unnecessary paperwork
Satisfying management only
Restricting creativity
Ensuring consistency and quality through documented instructions (Correct answer)

Correct answer: Ensuring consistency and quality through documented instructions

SOPs provide standardized instructions ensuring consistent quality regardless of which qualified person performs the work.

Question 84: In a patient with suspected functional (non-organic) visual field loss, which test finding is most helpful?

Tubular or spiral field defect on kinetic perimetry (Correct answer)
Enlarged blind spot on automated perimetry
Nasal step on static perimetry
Arcuate scotoma on 24-2 testing

Correct answer: Tubular or spiral field defect on kinetic perimetry

A tubular or spiral field defect—where the field fails to expand with increasing test distance—is a classic sign of non-organic visual field loss on kinetic perimetry.

Question 85: What is the first step in CO risk assessment?

Ignoring minor risks
Assigning blame
Purchasing insurance
Identifying potential hazards and threats (Correct answer)

Correct answer: Identifying potential hazards and threats

Risk assessment begins with systematic identification of all potential hazards, forming the foundation for all subsequent analysis.

Question 86: During a cover-uncover test, the uncovered eye makes a refixation movement from an outward position. This indicates:

Esotropia
Exophoria
Exotropia (Correct answer)
Hypertropia

Correct answer: Exotropia

An outward-to-inward refixation movement on uncover indicates the eye was deviated outward (exotropia) under cover.

Question 87: Fresnel press-on prisms incorporated into a spectacle lens are primarily used to manage:

Myopic astigmatism
Color vision deficiency
Diplopia caused by strabismus (Correct answer)
Presbyopia

Correct answer: Diplopia caused by strabismus

Fresnel press-on prisms are used to neutralize diplopia by redirecting the visual axis in patients with strabismus, especially when deviation may change over time.

Question 88: When a pediatric patient with osteogenesis imperfecta (brittle bone disease) presents for orthotic management, the orthotist should modify standard clinical practice by:

Delaying fabrication until the patient reaches skeletal maturity
Applying circumferential casting only
Avoiding all contact forces during casting and fitting to minimize fracture risk (Correct answer)
Proceeding with standard casting protocol to ensure accurate fit

Correct answer: Avoiding all contact forces during casting and fitting to minimize fracture risk

Patients with osteogenesis imperfecta are at high risk for fractures from minimal force; casting, fitting, and adjustments must use extremely gentle, minimal-force techniques.

Question 89: What is the primary ethical responsibility of an orthoptist during patient care?

Maximize clinic revenue
Only follow physician directions
Ensure patient confidentiality (Correct answer)
Follow patient preferences without question

Correct answer: Ensure patient confidentiality

Patient confidentiality is a fundamental ethical and legal principle in healthcare, ensuring that sensitive patient information is protected and not disclosed without consent. Orthoptists, like all healthcare professionals, have a primary responsibility to maintain the privacy and security of patient data, fostering trust and respecting patient autonomy.

Question 90: An orthoptist discovers a billing code was entered incorrectly, resulting in over-reimbursement. The correct course of action is to:

Leave it since the audit period has passed
Correct the record, refund the payer, and document the error and correction (Correct answer)
Ask the biller to offset it in future claims silently
Only correct if the amount exceeds $500

Correct answer: Correct the record, refund the payer, and document the error and correction

Knowingly retaining an overpayment without correction constitutes fraud under the False Claims Act; prompt disclosure and repayment are required.

Question 91: Low vision is generally defined as best-corrected visual acuity of:

20/40 in either eye
Less than 20/200 exclusively
Better than 20/40
20/70 or worse in the better eye (Correct answer)

Correct answer: 20/70 or worse in the better eye

Low vision is defined as best-corrected visual acuity of 20/70 or worse in the better eye that cannot be improved with standard optical correction.

Question 92: Which principle BEST describes the orthotist's role when a patient's medication causes a side effect that complicates orthotic outcomes?

Modify the medication schedule to optimize orthotic performance
Discontinue orthotic treatment until the medication side effect resolves
Independently manage side effects using topical over-the-counter remedies
Document findings and communicate concerns to the prescribing physician as part of the interprofessional team (Correct answer)

Correct answer: Document findings and communicate concerns to the prescribing physician as part of the interprofessional team

Orthotists are integral interprofessional team members who document medication-related complications and communicate them to the prescribing physician for collaborative management.

Question 93: In testing color vision with Ishihara plates, which type of color deficiency is most commonly detected?

Protan and deutan (red-green) deficiencies (Correct answer)
Tritanopia (blue-yellow)
Acquired optic nerve disease
Achromatopsia

Correct answer: Protan and deutan (red-green) deficiencies

Ishihara plates are specifically designed to detect congenital red-green color deficiencies (protan and deutan types).

Question 94: A 70-year-old presents with sudden painless vision loss in one eye described as a 'curtain coming down.' The most likely diagnosis is:

Central retinal artery occlusion (Correct answer)
Central retinal vein occlusion
Anterior ischemic optic neuropathy
Optic neuritis

Correct answer: Central retinal artery occlusion

Sudden, painless, profound unilateral vision loss like a descending curtain is classic for central retinal artery occlusion.

Question 95: The purpose of a Bangerter foil in amblyopia management is to:

Improve contrast sensitivity in the amblyopic eye directly
Apply graded blur to the fellow eye as a penalization method (Correct answer)
Eliminate diplopia in strabismic patients
Protect the amblyopic eye from bright light

Correct answer: Apply graded blur to the fellow eye as a penalization method

Bangerter foils are translucent filters applied to the fellow eye's spectacle lens to penalize it with graded blur, encouraging preferential use of the amblyopic eye.

Question 96: What is the correct hand hygiene protocol before examining a patient?

Wash only if visible dirt is present
Rinse hands without soap
Wash hands for at least 20 seconds (Correct answer)
Use gloves instead of washing hands

Correct answer: Wash hands for at least 20 seconds

Proper hand hygiene is the single most effective way to prevent the spread of infections in a healthcare setting. Washing hands thoroughly with soap and water for at least 20 seconds, or using an alcohol-based hand rub, is the standard protocol recommended by health organizations before and after patient contact to ensure patient and practitioner safety.

Question 97: During prism and alternate cover testing, you neutralize a deviation with 35 PD base-out. This measures the:

AC/A ratio
Total deviation (manifest + latent) (Correct answer)
Fusional vergence amplitude
Manifest deviation only

Correct answer: Total deviation (manifest + latent)

Alternate cover testing dissociates fusion, revealing the total deviation including any latent component.

Question 98: Stereoacuity of 40 seconds of arc measured with the Randot test indicates:

Fine stereopsis consistent with bifoveal fusion (Correct answer)
Gross stereopsis only
Suppression of one eye
Monocular depth cue reliance

Correct answer: Fine stereopsis consistent with bifoveal fusion

40 seconds of arc is considered fine stereopsis and is consistent with intact bifoveal fusion and normal binocular vision.

Question 99: When a patient refuses a recommended orthotic intervention, how should the orthotist document this in the medical record?

Omit the refusal to protect the patient's privacy
Write only that 'patient declined' without further detail
Transfer documentation responsibility to the referring physician
Document the refusal, the reason given, and the informed consent discussion that occurred (Correct answer)

Correct answer: Document the refusal, the reason given, and the informed consent discussion that occurred

Refusal of treatment must be documented with the patient's stated reason and a record that risks were explained, forming a refusal-of-treatment note.

Question 100: What is the primary treatment for amblyopia in young children?

Laser therapy
Corneal transplant
Occlusion therapy (patching) (Correct answer)
Cataract surgery

Correct answer: Occlusion therapy (patching)

Occlusion therapy, commonly known as patching, is the primary and most effective treatment for amblyopia in young children. It involves covering the stronger, better-seeing eye for a prescribed period each day, forcing the brain to use and develop the vision in the weaker, amblyopic eye. This stimulates the visual pathways and helps improve visual acuity.

Certified Orthoptist (CO) Certification Exam

The Certified Orthoptist (CO) certification validates an individual's expertise in the diagnosis and non-surgical management of disorders of the eye movements and associated visual problems.

100

Questions

180 min

Time Limit

70%

To Pass

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