Vision and Ophthalmology Ocular Anatomy and Physiology 2

Question 1

Which layer of the retina contains the cell bodies of the rod and cone photoreceptors?

Accepted Answer

Outer nuclear layer

Answer

The outer nuclear layer contains the nuclei (cell bodies) of both rod and cone photoreceptors.

Question 2

The blood-retinal barrier is maintained primarily by which cells?

Accepted Answer

Retinal pigment epithelium

Answer

The retinal pigment epithelium (RPE) forms the outer blood-retinal barrier via tight junctions between cells.

Question 3

The optic chiasm is located above which structure at the base of the brain?

Accepted Answer

Pituitary gland

Answer

The optic chiasm sits directly above the pituitary gland (sella turcica), which is why pituitary tumors commonly cause bitemporal visual field defects.

Question 4

Normal intraocular pressure (IOP) in adults ranges from approximately:

Accepted Answer

10–21 mmHg

Answer

Normal IOP is generally considered to be between 10 and 21 mmHg, with values above 21 mmHg considered elevated.

Question 5

Which structure controls the diameter of the pupil by constricting it?

Accepted Answer

Sphincter pupillae

Answer

The sphincter pupillae muscle, innervated by parasympathetic fibers via CN III, constricts the pupil (miosis).

Vision and Ophthalmology Practice Test

Vision and Ophthalmology Practice Test

Vision and Ophthalmology Ocular Anatomy and Physiology 2