Question 1

Which structure of the eye is responsible for bending light as it enters the eye and contains sodium pumps to maintain its clarity?

Accepted Answer

Cornea

Question 2

A patient presents with increased intraocular pressure due to blocked drainage of aqueous humor. What is the most likely diagnosis?

Accepted Answer

Glaucoma

Question 3

Which muscle is responsible for elevating the eye and turning it laterally, and which cranial nerve innervates it?

Accepted Answer

Inferior oblique, III (oculomotor)

Question 4

Which of the following best describes the function of the pigmented layer of the retina?

Accepted Answer

Absorbs light and prevents its scattering; stores vitamin A

Question 5

A person with myopia has a focal point that falls in front of the retina. Which lens type is used to correct this condition?

Accepted Answer

Concave lens

Question 6

Which sequence correctly traces the pathway of light entering the eye to the photoreceptors?

Accepted Answer

Cornea → aqueous humor → lens → vitreous humor → neural layer of retina → photoreceptors

Question 7

Which of the following is TRUE regarding rods and cones?

Accepted Answer

Rods are best suited for night vision and peripheral vision, while cones provide detailed, high-resolution color vision.

Question 8

During the process of phototransduction in rods, what is the immediate effect of light absorption by rhodopsin?

Accepted Answer

Retinal changes from the 11-cis to all-trans isomer and separates from opsin.

Question 9

Which of the following best explains why the optic disc is known as the 'blind spot'?

Accepted Answer

It is the site where the optic nerve leaves the eye and lacks photoreceptors.

Question 10

A patient has difficulty focusing on close objects due to loss of lens elasticity with age. What is this condition called?

Accepted Answer

Presbyopia

Question 11

Which equation best represents the relationship between the focal length ($$f$$), object distance ($$d_o$$), and image distance ($$d_i) $$for the lens of the eye?

Accepted Answer

$$\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}$$

Question 12

Which cranial nerve is responsible for innervating the lateral rectus muscle of the eye?

Accepted Answer

VI (abducens)

Question 13

Which of the following best describes the function of the lacrimal apparatus?

Accepted Answer

It secretes tears containing mucus, antibodies, and lysozyme, which drain into the nasal cavity.

Question 14

Which process occurs when moving from a dark room into bright sunlight, and what is the physiological response?

Accepted Answer

Light adaptation; pupils constrict and rod function ceases

Question 15

Which of the following is a function of the ciliary body?

Accepted Answer

Controls lens shape and secretes aqueous humor

Question 16

A patient is diagnosed with cataracts. Which of the following best describes this condition?

Accepted Answer

Clouding of the lens due to clumping of crystallin proteins

Question 17

Which of the following statements about the blood supply to the retina is correct?

Accepted Answer

The choroid supplies the outer third, and the central artery and vein supply the inner two-thirds.

Question 18

Which of the following best describes the effect of parasympathetic activation on the pupil?

Accepted Answer

Contracts the sphincter pupillae muscle, constricting the pupil

Question 19

Which of the following is the correct order of signal transmission in the retina after light is detected by photoreceptors?

Accepted Answer

Photoreceptors → bipolar cells → ganglion cells → optic nerve

Study Guide: Anatomy and Physiology of the Eye (Special Senses)

Study Guide - Practice Questions

Study Guide - Flashcards