Question 1

Which of the following is NOT considered one of the special senses?

Accepted Answer

Touch

Question 2

What is the primary function of the eyebrows as an accessory structure of the eye?

Accepted Answer

To shade the eye from sunlight and prevent perspiration from reaching the eye

Question 3

Which structure is responsible for producing the oily secretion that lubricates the eyelids?

Accepted Answer

Tarsal (Meibomian) glands

Question 4

A patient presents with 'bloodshot eyes' due to visible small blood vessels. Which membrane is most likely affected?

Accepted Answer

Bulbar conjunctiva

Question 5

Which of the following correctly describes the path of tears from production to drainage?

Accepted Answer

Lacrimal gland → lacrimal canaliculi → lacrimal sac → nasolacrimal duct → nasal cavity

Question 6

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

Accepted Answer

Superior rectus; III (oculomotor)

Question 7

A patient is unable to move their eye laterally. Which muscle and cranial nerve are most likely affected?

Accepted Answer

Lateral rectus; VI (abducens)

Question 8

Which layer of the eyeball is responsible for supplying blood to all layers and absorbing light to prevent scattering?

Accepted Answer

Choroid (vascular layer)

Question 9

What is the main function of the ciliary body in the eye?

Accepted Answer

To produce aqueous humor and control lens shape

Question 10

Which part of the retina is responsible for the highest visual acuity and contains only cones?

Accepted Answer

Fovea centralis

Question 11

Which of the following statements about rods and cones is TRUE?

Accepted Answer

Rods are more sensitive to light and provide noncolor vision

Question 12

A patient complains of double vision (diplopia). Which of the following is the most likely cause?

Accepted Answer

Uncoordinated movements of the external eye muscles

Question 13

Which equation best represents the refraction of light by a convex lens in the eye?

Accepted Answer

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

Question 14

During close vision, which physiological changes occur in the eye?

Accepted Answer

Ciliary muscle contracts, ciliary zonule loosens, lens bulges

Question 15

Which process is responsible for preventing most divergent light rays from entering the eye during close vision?

Accepted Answer

Accommodation pupillary reflex

Question 16

Which fluid in the eye is continuously formed and drained, supplying nutrients mainly to the lens and cornea?

Accepted Answer

Aqueous humor

Question 17

A patient with presbyopia is experiencing difficulty focusing on close objects. What is the underlying cause?

Accepted Answer

Loss of lens accommodation due to aging

Question 18

Which structure is referred to as the 'blind spot' of the eye, and why?

Accepted Answer

Optic disc; it lacks photoreceptors

Question 19

Which of the following best describes the function of the corneal endothelium?

Accepted Answer

Maintains corneal clarity via sodium pumps

Question 20

If the scleral venous sinus (canal of Schlemm) is blocked, which condition is most likely to develop?

Accepted Answer

Increased intraocular pressure leading to glaucoma

Chapter 15 Part 1: The Special Senses – The Eye and Vision

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