AOA Ocular Anatomy and Physiology

Question 1

Which layer of the cornea is responsible for its transparency and makes up approximately 90% of corneal thickness?

Accepted Answer

Stroma

Answer

The stroma constitutes about 90% of the cornea's thickness and is composed of regularly arranged collagen lamellae that contribute directly to corneal transparency.

Question 2

The aqueous humor is primarily produced by which ocular structure?

Accepted Answer

Ciliary body epithelium

Answer

The non-pigmented epithelium of the ciliary body actively secretes aqueous humor into the posterior chamber.

Question 3

The central retinal artery is a branch of which vessel?

Accepted Answer

Ophthalmic artery

Answer

The central retinal artery is a branch of the ophthalmic artery, which itself is the first branch of the internal carotid artery.

Question 4

Which photoreceptor type is responsible for scotopic (low-light) vision and is most densely concentrated in the peripheral retina?

Accepted Answer

Rods

Answer

Rods are highly sensitive photoreceptors that mediate scotopic vision and are densely distributed in the peripheral retina, outside the fovea.

Question 5

The fovea centralis is specialized for high-acuity vision primarily because it contains a high density of which cell type?

Accepted Answer

Cone photoreceptors

Answer

The fovea has the highest density of cone photoreceptors and lacks rods, providing maximum visual acuity and color discrimination.

AOA - American Optometric Association Practice Test

AOA - American Optometric Association Practice Test

AOA Ocular Anatomy and Physiology