CPOT CPOT Optical Dispensing & Lens Technology 3

Question 1

A patient complains of swim and sway when wearing new progressive addition lenses. The BEST first action is to:

Accepted Answer

Verify the PD and fitting height measurements and advise adaptation time

Answer

Immediately reorder the lenses in a different material

Answer

Switch the patient to bifocal lenses without consulting the doctor

Answer

Increase the add power to reduce the distortion zones

Question 2

The 'add power' in a bifocal or progressive lens prescription refers to the:

Accepted Answer

Additional plus power for near vision correction

Answer

Total power of the distance portion

Answer

Amount of prism prescribed

Answer

Minus cylinder to correct astigmatism

Question 3

When adjusting a metal frame, a technician uses heat to:

Accepted Answer

Soften and reshape the frame without cracking it

Answer

Tighten loose screws

Answer

Apply anti-scratch coating

Answer

Sterilize the frame

Question 4

High-index lens materials (e.g., 1.67, 1.74) are beneficial primarily because they:

Accepted Answer

Produce thinner, lighter lenses for strong prescriptions

Answer

Eliminate the need for UV coatings

Answer

Have higher Abbe values than CR-39

Answer

Are more impact-resistant than polycarbonate

Question 5

Segment height in a bifocal lens is measured from the:

Accepted Answer

Bottom of the lens to the top of the bifocal segment

Answer

Top of the frame to the top of the bifocal segment

Answer

Pupil to the bottom of the frame

Answer

Optical center to the lens edge

Question 6

Polarized lenses reduce glare primarily by blocking light waves that are:

Accepted Answer

Horizontally polarized after reflection

Answer

Vertically oriented

Answer

Randomly scattered

Answer

UV wavelengths only