CPOA Basic Science 2

Question 1

Which layer of the cornea serves as the primary barrier against infection and is responsible for most corneal sensation?

Accepted Answer

Epithelium

Answer

The corneal epithelium is the outermost layer and acts as the first line of defense against pathogens while containing most of the cornea's sensory nerve endings.

Question 2

The aqueous humor is produced by which ocular structure?

Accepted Answer

Ciliary body

Answer

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

Question 3

What is the approximate pH of normal tears?

Accepted Answer

7.4

Answer

Normal tears have a pH of approximately 7.4, which is slightly alkaline and similar to blood plasma.

Question 4

The fovea centralis is located within which larger retinal landmark?

Accepted Answer

Macula lutea

Answer

The fovea centralis is the central pit within the macula lutea and is responsible for the sharpest central vision.

Question 5

Which cranial nerve controls the superior oblique extraocular muscle?

Accepted Answer

CN IV (Trochlear)

Answer

Cranial nerve IV (trochlear) is the sole innervator of the superior oblique muscle, which intorts and depresses the eye.

(CPOA) Certified Paraoptometric Assistant Practice Test

(CPOA) Certified Paraoptometric Assistant Practice Test

CPOA Basic Science 2