CPOT Optical Dispensing & Lens Technology Flashcards
6 cards from real CPOT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CPOT Optical Dispensing & Lens Technology flashcards as text
A patient complains of swim and sway when wearing new progressive addition lenses. The BEST first action is to:
Answer: Verify the PD and fitting height measurements and advise adaptation time
Swim and sway with new PALs is often due to incorrect fitting measurements or normal adaptation; verifying PD and seg height is the first troubleshooting step.
The 'add power' in a bifocal or progressive lens prescription refers to the:
Answer: Additional plus power for near vision correction
The add power is the additional converging (plus) power added to the distance prescription to allow the patient to see clearly at near, compensating for reduced accommodation.
When adjusting a metal frame, a technician uses heat to:
Answer: Soften and reshape the frame without cracking it
Heating metal frames (and especially plastic frames) makes them pliable so adjustments can be made without cracking or stressing the material.
High-index lens materials (e.g., 1.67, 1.74) are beneficial primarily because they:
Answer: Produce thinner, lighter lenses for strong prescriptions
High-index materials bend light more efficiently, allowing the same prescription to be ground in a thinner, lighter lens, improving cosmetics for stronger powers.
Segment height in a bifocal lens is measured from the:
Answer: Bottom of the lens to the top of the bifocal segment
Seg height is measured vertically from the bottom of the lens (or lowest point of the frame) to the top of the bifocal reading segment.
Polarized lenses reduce glare primarily by blocking light waves that are:
Answer: Horizontally polarized after reflection
Light reflected from flat surfaces such as roads and water becomes horizontally polarized; polarized lenses contain a vertical filter that blocks this reflected glare.