ABO NOCE Basic Opticianry Ocular Anatomy and Physiology Questions and Answers 3

Question 1

The crystalline lens derives its nutrition primarily from which source?

Accepted Answer

Aqueous humor

Answer

The avascular crystalline lens relies on diffusion of nutrients — glucose and amino acids — from the aqueous humor.

Question 2

Which extraocular muscle is responsible for intorsion and depression of the eye?

Accepted Answer

Superior oblique

Answer

The superior oblique muscle primarily intorts and depresses the eye, and is innervated by the trochlear nerve (CN IV).

Question 3

The normal intraocular pressure range in a healthy adult is approximately:

Accepted Answer

10–21 mmHg

Answer

Normal intraocular pressure is considered 10–21 mmHg; pressures consistently above 21 mmHg may indicate ocular hypertension.

Question 4

Which structure forms the outermost fibrous tunic of the eye?

Accepted Answer

Sclera

Answer

The sclera is the tough, white outer fibrous coat that protects the inner structures and maintains the eye's shape.

Question 5

The lacrimal puncta are small openings located at the:

Accepted Answer

Medial canthus of each eyelid

Answer

The lacrimal puncta are located on the medial margin of both upper and lower eyelids and drain tears into the lacrimal canaliculi.

ABO NOCE Basic Opticianry Practice Test