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

Question 1

Which layer of the cornea is responsible for maintaining corneal transparency through active fluid pumping?

Accepted Answer

Corneal endothelium

Answer

The corneal endothelium uses active Na+/K+ ATPase pumps to remove fluid from the stroma, maintaining dehydration and transparency.

Question 2

The fovea centralis is important in opticianry because:

Accepted Answer

It provides the highest visual acuity and is the target for optical center placement

Answer

The fovea centralis contains the highest density of cone photoreceptors, providing maximum visual acuity. Optical centers should align with the line of sight to the fovea.

Question 3

What is the function of the ciliary muscle in accommodation?

Accepted Answer

It contracts to release zonular tension, allowing the crystalline lens to become more convex

Answer

Ciliary muscle contraction releases tension on the zonules, allowing the elastic crystalline lens to increase curvature (become more convex) for near focus.

Question 4

The aqueous humor is produced by the:

Accepted Answer

Ciliary body (ciliary processes)

Answer

The ciliary processes of the ciliary body secrete aqueous humor, which fills the anterior and posterior chambers and maintains intraocular pressure.

Question 5

Which cranial nerve controls most of the extraocular muscles responsible for eye movement?

Accepted Answer

Cranial nerve III (oculomotor)

Answer

CN III (oculomotor nerve) innervates the superior rectus, inferior rectus, medial rectus, inferior oblique, and levator palpebrae — controlling most eye movements.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

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