$$\frac{\text{distance at which the test is performed}}{\text{distance at which a normal eye can read the line}}$$

Question 1

Which structure in the retina is responsible for the physiological blind spot, and why does this occur?

Accepted Answer

The optic disc, because it is where the optic nerve exits and contains no photoreceptors.

Question 2

During accommodation for near vision, which of the following changes occur in the eye?

Accepted Answer

The ciliary muscle contracts and the lens becomes more convex.

Question 3

A patient has a visual acuity of 20/100 on the Snellen chart. What does this mean?

Accepted Answer

They can read at 20 feet what a normal person can read at 100 feet.

Question 4

Which of the following best describes astigmatism?

Accepted Answer

A refractive error caused by an irregular curvature of the cornea or lens.

Question 5

Which test is used to diagnose color blindness?

Accepted Answer

Ishihara color plates

Question 6

What is the normal response of the pupil during the accommodation pupillary reflex?

Accepted Answer

The pupil constricts to increase depth of focus.

Question 7

Which lens type is used to correct myopia (nearsightedness)?

Accepted Answer

Concave lens

Question 8

A 60-year-old patient complains of difficulty focusing on close objects. Which condition is most likely?

Accepted Answer

Presbyopia

Question 9

Which of the following best explains why depth perception is possible?

Accepted Answer

The primary visual cortex fuses slightly different images from each eye.

Question 10

Which of the following is the correct formula for Snellen visual acuity?

Accepted Answer

$$\frac{	ext{distance at which the test is performed}}{	ext{distance at which a normal eye can read the line}}$$

Question 11

Which of the following is NOT a stimulus for the photopupillary reflex?

Accepted Answer

Focusing on a near object

Question 12

Which of the following best describes the change in lens shape during distant vision?

Accepted Answer

The lens flattens due to relaxation of the ciliary muscle.

Question 13

A person with hyperopia (farsightedness) would have difficulty focusing on which type of object?

Accepted Answer

Close objects

Question 14

Which of the following is a common misconception about astigmatism?

Accepted Answer

It can be diagnosed with a Snellen eye chart.

Question 15

Which of the following best describes the effect of aging on accommodation?

Accepted Answer

The lens becomes less elastic, making close focus more difficult.

Question 16

Which of the following is the correct sequence of events when focusing on a near object?

Accepted Answer

Ciliary muscle contracts, lens thickens, pupil constricts

Question 17

Which of the following is the main cause of color blindness?

Accepted Answer

Lack of a particular type of cone in the retina

Question 18

Which of the following best explains why a person with myopia can see near objects clearly but not distant objects?

Accepted Answer

The eyeball is too long, causing light to focus in front of the retina.

Question 19

Which of the following is a real-life application of the accommodation reflex?

Accepted Answer

Reading a book and then looking up at a distant clock.

Question 20

Which of the following best describes the function of the fovea?

Accepted Answer

It is the area of highest visual acuity due to a high density of cones.

Visual Tests and Common Visual Disorders: Study Notes for Anatomy & Physiology

Study Guide - Practice Questions