CPOA Spectacle Dispensing 2

Question 1

Which frame measurement represents the distance between the two lenses at the closest point?

Accepted Answer

Bridge size (DBL)

Answer

The DBL (distance between lenses) measures the bridge width between the two lens openings at their closest point.

Question 2

A patient's prescription reads OD: -3.00 -1.00 x 090. What type of lens power does the '-1.00' represent?

Accepted Answer

Cylinder power

Answer

The second value in a prescription (preceded by the axis) is the cylinder power, which corrects astigmatism.

Question 3

When adjusting nose pads to eliminate red marks on the patient's nose, the optician should:

Accepted Answer

Widen the pad spread

Answer

Widening the pad spread distributes weight over a larger skin area, reducing pressure and marks.

Question 4

Anti-reflective (AR) coating primarily benefits patients by:

Accepted Answer

Reducing glare and improving light transmission

Answer

AR coating reduces surface reflections, allowing more light to pass through and minimizing glare for the wearer.

Question 5

Which lens material has the highest Abbe value (least chromatic aberration)?

Accepted Answer

CR-39 plastic

Answer

CR-39 has an Abbe value of about 58, the highest among common ophthalmic lens materials, meaning less color fringing.

(CPOA) Certified Paraoptometric Assistant Practice Test