NOCE Spectacle Dispensing Procedures Questions and Answers — Questions and Answers
Question 1: A patient returns complaining their new glasses cause the floor to appear tilted and "bowed." The prescription and pupillary distance measurements have been verified as correct. Which of the following frame adjustments is most likely to resolve this complaint?
- Decrease the face form (wrap) of the frame.
- Ensure both temples are level with each other.
- Increase the pantoscopic tilt. (Correct answer)
- Widen the nose pads for a lower fit.
Correct answer: Increase the pantoscopic tilt.
The sensation of a tilted or bowed floor, especially with new prescriptions or progressive lenses, is often caused by how the lenses are angled in front of the eyes. Increasing the pantoscopic tilt (angling the bottom of the lenses closer to the cheeks) can better align the optical axis with the eye's natural visual axis when looking down, often reducing this perceptual distortion.
Question 2: When dispensing new polarized sunglasses, what is the most accurate explanation of their primary benefit to the patient?
- They reduce blinding glare from horizontal surfaces like water and pavement. (Correct answer)
- They automatically darken in bright sunlight and lighten indoors.
- They provide superior scratch resistance compared to standard lenses.
- They block a higher percentage of UV light than non-polarized lenses.
Correct answer: They reduce blinding glare from horizontal surfaces like water and pavement.
The primary and unique function of polarized lenses is to filter out horizontally polarized light. This type of light is created when sunlight reflects off flat surfaces, causing intense, blinding glare. While many polarized lenses also offer UV protection, and reducing glare can make colors seem more vivid, their main purpose is glare elimination.
Question 3: An optician is fitting a patient with a high-wrap sports frame that will have a prescription. To ensure the laboratory can accurately compensate the prescription for the frame's curvature, which measurement is most critical to provide in addition to the PD and fitting height?
- Temple length
- DBC (distance between centers)
- B measurement of the lens
- Face form angle (Correct answer)
Correct answer: Face form angle
A high-wrap or 'face form' angle induces power changes and prismatic effects that are not present when viewing through a flatter frame. The laboratory must know the specific face form angle to recalculate the prescription, compensating for these effects to provide clear, comfortable vision.
Question 4: A long-time single-vision wearer is trying their first pair of progressive addition lenses and complains of peripheral distortion and a "swimming" sensation when they turn their head. What is the most appropriate first step for the optician?
- Tell the patient this is a normal part of adaptation and to return in two weeks.
- Re-verify the monocular PDs and fitting heights are correctly positioned in the frame. (Correct answer)
- Immediately order a different, 'softer' progressive lens design.
- Offer to remake the glasses into a lined bifocal.
Correct answer: Re-verify the monocular PDs and fitting heights are correctly positioned in the frame.
While adaptation issues are common, the first and most crucial step is to rule out measurement error. Incorrect monocular pupillary distances or fitting heights are a frequent cause of non-tolerance in progressive lenses, leading to the exact symptoms described. Verifying these measurements should always precede any discussion of lens design changes or adaptation time.
Question 5: When adjusting a zyl (cellulose acetate) frame that is fitting too wide for the patient, what is the proper procedure?
- Bend the end pieces inward without applying any heat.
- File down the inside of the bridge for a narrower fit.
- Heat the bridge and gently push inward to narrow the fit. (Correct answer)
- Increase the curve of the temple bends behind the ears.
Correct answer: Heat the bridge and gently push inward to narrow the fit.
Cellulose acetate must be warmed to become pliable for adjustments. To narrow the overall fit of the frame front, the bridge should be gently heated with a frame warmer and then pushed inward, effectively decreasing the distance between the lenses and temples. Adjusting without heat will likely break the frame.
Question 6: During the final dispensing appointment, which of the following is the most crucial instruction for ensuring a new progressive lens wearer adapts successfully?
- "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."
- "Alternate wearing your new glasses with your old glasses for the first week."
- "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.
NOCE Spectacle Dispensing Procedures Questions and Answers
A patient returns complaining their new glasses cause the floor to appear tilted and "bowed." The prescription and pupillary distance measurements have been verified as correct.
Which of the following frame adjustments is most likely to resolve this complaint?