Spectacle Dispensing and Fitting Questions and Answers Flashcards
7 cards from real ABO NOCE Basic Opticianry practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Spectacle Dispensing and Fitting Questions and Answers flashcards as text
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?
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.
When measuring the distance PD with a pupillometer, the instrument should be set to:
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.
A frame with a 52-18-140 size marking has a bridge size of:
Answer: 18 mm
In the boxing system notation A-B-C, the middle number (18) represents the bridge (DBL) size in millimeters.
Which fitting consideration is MOST important when dispensing high minus lenses to minimize edge thickness?
Answer: Select a frame with a small eye size
Smaller frames reduce the peripheral edge diameter of minus lenses, significantly decreasing edge thickness.
Pantoscopic tilt is the angle formed between the lens plane and:
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.
A patient with a high plus prescription requires a reduced vertex distance. This is because increasing vertex distance in plus lenses effectively:
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.
When adjusting temple spread on a plastic frame to prevent slipping, the optician should:
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.