Free National Opticianry Competency Questions and Answers

Question 1

You can change a lens' focal length by:

Accepted Answer

Changing the curvature of one surface

Answer

Coating the surface

Answer

Making the lens bigger

Answer

Making the lens smaller

Question 2

Types of "meniscus," "equiconcave," and "flat concave"

Accepted Answer

Minus lenses

Answer

Spherocylinder lenses

Answer

Astigmatic lenses

Answer

Plus lenses

Question 3

What sort of lens has a surface that is both convex and concave?

Accepted Answer

Meniscus

Answer

Plano-convex

Answer

Biconcave

Answer

Biconvex

Question 4

A lens's power is indicated by the word "axis."

Accepted Answer

FALSE

Answer

TRUE

Question 5

What word best describes the direction change of light as it moves from one medium to another?

Accepted Answer

Refraction

Answer

Reflection

Answer

Retraction

Answer

Diffusion

Question 6

What determines how much light reaches the eye?

Accepted Answer

Iris

Answer

Pupil

Answer

Crystalline Lens

Answer

Fovea

Question 7

What name is given to the propensity of the eye to turn from its natural position?

Accepted Answer

Phoria

Answer

Tropia

Answer

Exophoria

Answer

Exotropia