FREE NOCE Ophthalmic Optics Principles Questions and Answers

Question 1

A patient's prescription is -6.00 D sphere. The optical center is displaced 5 mm horizontally from the patient's pupillary distance. Using Prentice's Rule, what is the amount of induced prism?

Accepted Answer

3.0 Δ

Answer

1.5 Δ

Answer

6.0 Δ

Answer

12.0 Δ

Question 2

A patient with a high myopic prescription of -10.00 D was refracted at a vertex distance of 14 mm. If their new glasses are fit with a vertex distance of 9 mm, what is the compensated power required to provide the same effective power?

Accepted Answer

-9.09 D

Answer

-10.00 D

Answer

-9.52 D

Answer

-10.53 D

Question 3

Which of the following ophthalmic lens materials has the highest index of refraction, resulting in the thinnest lens for a given prescription?

Accepted Answer

High-Index Plastic (1.74)

Answer

Crown Glass

Answer

CR-39

Answer

Polycarbonate

Question 4

A patient reports seeing color fringes around objects, especially in their peripheral vision. This phenomenon is most likely caused by which lens aberration?

Accepted Answer

Chromatic Aberration

Answer

Spherical Aberration

Answer

Coma

Answer

Distortion

Question 5

In a myopic eye, parallel light rays from a distant object come to a focus:

Accepted Answer

in front of the retina

Answer

directly on the retina

Answer

behind the retina

Answer

on the optic nerve

Question 6

Slab-off prism is ground on a spectacle lens to correct for:

Accepted Answer

vertical imbalance at the reading level

Answer

horizontal phoria

Answer

anisometropia

Answer

high astigmatism

A patient's prescription is -6.00 D sphere.The optical center is displaced 5 mm horizontally from the patient's pupillary distance.Using Prentice's Rule, what is the amount of induced prism?

A patient's prescription is -6.00 D sphere.
The optical center is displaced 5 mm horizontally from the patient's pupillary distance.
Using Prentice's Rule, what is the amount of induced prism?