CPOA Ocular Anatomy 2

Question 1

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

Accepted Answer

Stroma

Answer

The stroma consists of regularly arranged collagen lamellae that give the cornea its optical clarity and comprises about 90% of corneal thickness.

Question 2

What is the name of the junction between the cornea and the sclera?

Accepted Answer

Limbus

Answer

The limbus is the transitional zone where the transparent cornea meets the opaque white sclera.

Question 3

The fovea centralis is located within which structure?

Accepted Answer

Macula lutea

Answer

The fovea centralis is a small depression at the center of the macula lutea that provides the sharpest visual acuity.

Question 4

Which muscle is responsible for depressing and abducting the eye?

Accepted Answer

Superior oblique

Answer

The superior oblique muscle primarily intorts and depresses the eye, with a secondary action of abduction.

Question 5

What type of cells are predominantly found in the fovea?

Accepted Answer

Cone photoreceptors

Answer

The fovea contains only cone photoreceptors, which are responsible for high-acuity color vision in bright light.

(CPOA) Certified Paraoptometric Assistant Practice Test