ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting 2 — Questions and Answers
Question 1: A patient's frame sits too low on the nose, causing the optical centers to be above the patient's pupils. What adjustment is most appropriate?
- Increase pantoscopic tilt
- Raise the nose pads (Correct answer)
- Widen the temples
- Decrease the vertex distance
Correct answer: Raise the nose pads
Raising the nose pads lifts the frame so the optical centers align properly with the patient's pupils.
Question 2: When measuring pupillary distance (PD) for a patient with significant facial asymmetry, which method is most accurate?
- Binocular PD only
- Monocular PD from each eye to the nose bridge (Correct answer)
- Average of three binocular measurements
- Distance PD minus 3mm for near
Correct answer: Monocular PD from each eye to the nose bridge
Monocular PD measurements account for facial asymmetry by measuring each eye independently from the nose bridge.
Question 3: A patient complains of a 'swim' sensation after receiving new progressive lenses. The most likely cause is:
- Incorrect PD
- Excessive pantoscopic tilt
- Improper fitting height
- All of the above (Correct answer)
Correct answer: All of the above
Swim sensation in progressive lenses can result from incorrect PD, improper fitting height, or excessive pantoscopic tilt, as all affect the progressive corridor alignment.
Question 4: The standard vertex distance used when prescribing trial frame refraction is:
- 10mm
- 12mm (Correct answer)
- 14mm
- 16mm
Correct answer: 12mm
The standard vertex distance for trial frame refraction is 12mm, and prescriptions are compensated if the actual vertex distance differs significantly.
Question 5: Which temple style provides the most secure fit for an active patient?
- Skull temple
- Cable (riding bow) temple (Correct answer)
- Convertible temple
- Library (straight) temple
Correct answer: Cable (riding bow) temple
Cable temples wrap around the ear and provide the most secure fit, making them ideal for active patients or children.
Question 6: When adjusting a frame with a high minus prescription, the optician should ensure the vertex distance is:
- Maximized to reduce magnification
- Minimized to increase effective power
- Minimized to reduce effective power (less minus) (Correct answer)
- Exactly 20mm for standardization
Correct answer: Minimized to reduce effective power (less minus)
For minus lenses, decreasing vertex distance reduces the effective minus power experienced by the eye, so a shorter vertex distance yields less effective minus.
Question 7: A patient's frame shows unequal temple pressure, with one side tighter than the other. The optician should first:
- Replace the frame entirely
- Adjust the bend of the tighter temple (Correct answer)
- Add temple cushions to both sides
- Recommend a different frame style
Correct answer: Adjust the bend of the tighter temple
Adjusting the bend of the tighter temple equalizes the pressure on both sides of the head without replacing the frame.
ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting 2
A patient's frame sits too low on the nose, causing the optical centers to be above the patient's pupils.
What adjustment is most appropriate?