Question 1

What is the function of rods?&#10;A) vision in dim light&#10;B) vision in bright light&#10;C) color vision&#10;D) none of the above

Accepted Answer

Rods are responsible for vision in dim light. They are more sensitive to light than cones and can detect low levels of light, allowing us to see in low light conditions. However, they do not allow us to see colors or fine details, which is the function of cones.

Question 2

What part of the eye prevents the eyeball from collapsing?&#10;A) aqueous humor&#10;B) vitreous body&#10;C) suspensory ligaments&#10;D) ciliary processes

Accepted Answer

The vitreous body, a gel-like substance, is located in the posterior cavity of the eye and helps to maintain the shape of the eyeball by exerting pressure outward, preventing it from collapsing.

Question 3

What structure distributes tears across the surface of the eye?&#10;A) palpebrae&#10;B) lacrimal caruncle&#10;C) eyelashes&#10;D) ciliary glands

Accepted Answer

The palpebrae, or eyelids, move tears across the surface of the eye to keep it lubricated and clean.

Question 4

What part of the eye changes shape to regulate the amount of light entering the lens?&#10;A) iris&#10;B) ciliary body&#10;C) lens&#10;D) pupil

Accepted Answer

The answer of What part of the eye changes shape...

Question 5

An ophthalmoscope is used to observe what part of the eye?&#10;A) fibrous tunic&#10;B) retina&#10;C) the optic chiasm&#10;D) vascular tunic

Accepted Answer

An ophthalmoscope is used to observe the retina, the innermost layer of tissue in the back of the eye that contains photoreceptor cells responsible for vision.

Question 6

What is the main function of the cones of the eye?&#10;A) depth perception&#10;B) color vision&#10;C) vision in dim light&#10;D) accommodation for near vision

Accepted Answer

The cones of the eye are responsible for color vision.

Question 7

What structure drains tears into the nasal cavity?&#10;A) lacrimal puncta&#10;B) nasolacrimal duct&#10;C) lacrimal ducts&#10;D) lacrimal canals

Accepted Answer

The nasolacrimal duct drains tears into the nasal cavity. The lacrimal puncta are small openings on the edge of each eyelid that allow tears to enter the lacrimal canals, which then drain into the nasolacrimal duct. The lacrimal ducts do not exist, so choice C is incorrect. Similarly, lacrimal canals do exist but do not directly drain tears into the nasal cavity, so choice D is also incorrect.

Question 8

The oily substance found in tears to prevent the eyelids from sticking together is produced by the ________.&#10;A) lacrimal glands&#10;B) ciliary gland&#10;C) conjunctiva&#10;D) tarsal glands

Accepted Answer

The tarsal glands are located in the upper and lower eyelids and produce an oily substance called meibum, which prevents the eyelids from sticking together and helps lubricate the surface of the eye. The lacrimal glands produce the watery component of tears, the ciliary gland is not involved in tear production, and the conjunctiva is a thin membrane that covers the front of the eye and inner surface of the eyelids, but it does not produce tear fluid.

Question 9

What is the blind spot in the eye?&#10;A) where the macula lutea is found&#10;B) more cones than rods are found&#10;C) where the optic nerve leaves the eye&#10;D) only rods occur

Accepted Answer

The blind spot in the eye is where the optic nerve leaves the eye, and no photoreceptor cells are present in this region. This can lead to a small gap in our vision, which is compensated for by the overlapping of the visual fields from both eyes.

Question 10

The tarsal plate of the eye ________.&#10;A) is connected to the superior rectus muscle&#10;B) assists in winking&#10;C) is connected to the levator palpebrae superioris&#10;D) is made up of connective tissue that surrounds a cartilage plate.

Accepted Answer

The tarsal plate of the eye is connected to the levator palpebrae superioris muscle, which helps to lift the upper eyelid.

Question 11

All of the following are muscles that control movements of the eyeball EXCEPT ________.&#10;A) inferior oblique&#10;B) superior rectus&#10;C) orbicularis oculi&#10;D) medial rectus

Accepted Answer

The answer of All of the following are muscles that...

Question 12

The fibrous tunic consists of all of the following EXCEPT ________.&#10;A) cornea&#10;B) iris&#10;C) sclera&#10;D) corneal limbus

Accepted Answer

The answer of The fibrous tunic consists of all of...

Question 13

Which part of the retina has an area of high cone density?&#10;A) choroid&#10;B) optic disc&#10;C) macula lutea&#10;D) none of the above

Accepted Answer

The answer of Which part of the retina has an...

Question 14

Which cells of the retina form a network that either inhibits or facilitates communication between the photoreceptors and the bipolar cells?&#10;A) ganglion cells&#10;B) amacrine cells&#10;C) horizontal cells&#10;D) bipolar cells

Accepted Answer

The answer of Which cells of the retina form a...

Question 15

There are three layers of nerve cells in the retina. Which cells in those layers form the optic nerve?&#10;A) rods&#10;B) bipolar cells&#10;C) cones&#10;D) ganglion cells

Accepted Answer

The answer of There are three layers of nerve cells...

Question 16

Which structure CANNOT be seen by looking at someone's eye with an ophthalmoscope?&#10;A) optic chiasm&#10;B) fovea&#10;C) macula lutea&#10;D) optic disc

Accepted Answer

The answer of Which structure CANNOT be seen by looking...

Question 17

Which part of the eye is highly vascularized and contains melanin that absorbs light to prevent reflection?&#10;A) sclera&#10;B) choroid&#10;C) iris&#10;D) retina

Accepted Answer

The answer of Which part of the eye is highly...

Question 18

Which muscles close the eyelids?&#10;A) superior rectus&#10;B) lateral rectus&#10;C) levator palpebrae superioris&#10;D) orbicularis oris

Accepted Answer

The answer of Which muscles close the eyelids?&#10;A) superior rectus&#10;B)...

Deck 29: Anatomy of the Eye