ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting Questions and Answers 2 — Questions and Answers
Question 1: A patient complains their new progressive lenses cause the floor to appear to sway when walking. Which adjustment is most likely to reduce this effect?
- Increase the pantoscopic tilt
- Ensure proper monocular PD measurement was used (Correct answer)
- Increase the vertex distance
- Add more base-in prism
Correct answer: Ensure proper monocular PD measurement was used
Incorrect monocular PD causes the wearer to view through off-center portions of the progressive corridor, causing spatial distortion and swim.
Question 2: When measuring the distance PD with a pupillometer, the instrument should be set to:
- Near vision mode at 40 cm
- Infinity or far vision mode (Correct answer)
- Intermediate vision mode at 60 cm
- The patient's working distance
Correct answer: Infinity or far vision mode
For distance PD measurement, the pupillometer must be set to infinity (far vision mode) so the patient's eyes are parallel.
Question 3: A frame with a 52-18-140 size marking has a bridge size of:
- 52 mm
- 18 mm (Correct answer)
- 140 mm
- 34 mm
Correct answer: 18 mm
In the boxing system notation A-B-C, the middle number (18) represents the bridge (DBL) size in millimeters.
Question 4: Which fitting consideration is MOST important when dispensing high minus lenses to minimize edge thickness?
- Choose a large frame to increase optical area
- Select a frame with a small eye size (Correct answer)
- Use a metal frame for better weight distribution
- Increase the vertex distance
Correct answer: Select a frame with a small eye size
Smaller frames reduce the peripheral edge diameter of minus lenses, significantly decreasing edge thickness.
Question 5: Pantoscopic tilt is the angle formed between the lens plane and:
- The horizontal plane (Correct answer)
- The vertical plane
- The bridge of the nose
- The patient's line of sight
Correct answer: The horizontal plane
Pantoscopic tilt is measured as the angle the lens plane makes with the vertical — equivalently, the deviation from perpendicular to the horizontal plane.
Question 6: A patient with a high plus prescription requires a reduced vertex distance. This is because increasing vertex distance in plus lenses effectively:
- Increases the effective plus power
- Decreases the effective plus power (Correct answer)
- Has no effect on effective power
- Increases chromatic aberration only
Correct answer: Decreases the effective plus power
Moving a plus lens away from the eye decreases its effective power at the corneal plane, so a patient may need a stronger prescription or closer fit.
Question 7: When adjusting temple spread on a plastic frame to prevent slipping, the optician should:
- Heat the endpiece area and bend the temples inward (Correct answer)
- Tighten the hinge screws only
- Bend the temples outward at the skull bend
- Replace the nose pads
Correct answer: Heat the endpiece area and bend the temples inward
Heating the endpiece area of a plastic frame allows the temples to be bent inward (reduced spread) to improve grip on the head.
ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting Questions and Answers 2
A patient complains their new progressive lenses cause the floor to appear to sway when walking.
Which adjustment is most likely to reduce this effect?