ABO NOCE Basic Opticianry Ocular Anatomy and Physiology 5

Question 1

The retinal pigment epithelium (RPE) is located between which two structures?

Accepted Answer

Photoreceptors and choroid

Answer

The RPE is a single layer of pigmented cells located between the photoreceptor outer segments and the choroidal vasculature (Bruch's membrane).

Question 2

Which structure is responsible for draining aqueous humor from the eye?

Accepted Answer

Schlemm's canal

Answer

Schlemm's canal (the scleral venous sinus) collects aqueous humor from the trabecular meshwork and drains it into the episcleral veins.

Question 3

What percentage of the eye's total refractive power is provided by the cornea?

Accepted Answer

67%

Answer

The cornea provides approximately two-thirds (about 43 of the total ~60 diopters, or ~67%) of the eye's total refractive power.

Question 4

Which extraocular muscle is innervated by cranial nerve IV (trochlear nerve)?

Accepted Answer

Superior oblique

Answer

The trochlear nerve (CN IV) innervates only the superior oblique muscle, which depresses and intorts the eye.

Question 5

The angle of the anterior chamber is formed by the junction of the:

Accepted Answer

Iris and cornea

Answer

The iridocorneal angle (anterior chamber angle) is formed where the peripheral iris meets the posterior cornea, and it contains the trabecular meshwork.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Ocular Anatomy and Physiology 5