ABO NOCE Basic Opticianry Ocular Anatomy and Physiology Questions and Answers 2

Question 1

Which layer of the cornea is responsible for maintaining its dehydrated, transparent state?

Accepted Answer

Endothelium

Answer

The corneal endothelium actively pumps fluid out of the stroma via ion transport to maintain corneal transparency.

Question 2

The fovea centralis is located within which anatomical structure?

Accepted Answer

Macula lutea

Answer

The fovea centralis is the central pit within the macula lutea that provides the highest visual acuity.

Question 3

Which muscle controls the width of the pupil in bright light conditions?

Accepted Answer

Sphincter pupillae

Answer

The sphincter pupillae is a circular muscle innervated by parasympathetic fibers that constricts the pupil (miosis) in bright light.

Question 4

Aqueous humor is primarily produced by which structure?

Accepted Answer

Ciliary body epithelium

Answer

The nonpigmented epithelium of the ciliary body secretes aqueous humor into the posterior chamber.

Question 5

The vitreous humor occupies approximately what percentage of the eye's total volume?

Accepted Answer

80%

Answer

The vitreous chamber makes up about 80% of the eye's total volume, with the vitreous being a gel-like substance filling it.

ABO NOCE Basic Opticianry Practice Test