ABO NOCE Basic Opticianry Ocular Anatomy and Physiology 3

Question 1

The vitreous humor occupies which chamber of the eye?

Accepted Answer

Vitreous chamber

Answer

The vitreous humor fills the vitreous chamber (posterior segment), which is the large cavity behind the lens.

Question 2

Which layer of the cornea is responsible for most of its refractive power?

Accepted Answer

Stroma

Answer

The stroma comprises about 90% of corneal thickness and, together with its curvature, contributes most of the cornea's refractive power.

Question 3

The fovea centralis is located in which part of the retina?

Accepted Answer

Macula lutea

Answer

The fovea centralis is a small depression at the center of the macula lutea, containing the highest concentration of cones for maximum visual acuity.

Question 4

What is the primary function of the choroid layer?

Accepted Answer

Provide nutrient supply to the outer retina

Answer

The choroid is a highly vascular layer that provides oxygen and nutrients to the outer retinal layers, including the photoreceptors.

Question 5

Which muscle of the iris constricts the pupil (miosis)?

Accepted Answer

Sphincter pupillae

Answer

The sphincter pupillae muscle, innervated by the parasympathetic nervous system via CN III, constricts the pupil.

ABO NOCE Basic Opticianry Practice Test