ABO NOCE Basic Opticianry Ocular Anatomy and Physiology 4

Question 1

The corneal endothelium pumps fluid out of the cornea to maintain its transparency. This process requires which ion?

Accepted Answer

Sodium

Answer

The corneal endothelium uses Na+/K+-ATPase pumps driven by sodium ions to actively transport fluid out of the corneal stroma.

Question 2

Which part of the optic nerve is visible during fundoscopic examination?

Accepted Answer

Optic disc

Answer

The optic disc (optic nerve head) is the only part of the optic nerve visible during fundoscopy; it appears as a pale oval disc on the retina.

Question 3

Which type of photoreceptor is most sensitive to low-light (scotopic) conditions?

Accepted Answer

Rods

Answer

Rods are highly sensitive photoreceptors that function in dim light (scotopic vision) and are responsible for peripheral and night vision.

Question 4

The zonules of Zinn connect the lens to which structure?

Accepted Answer

Ciliary body

Answer

The zonular fibers (zonules of Zinn) suspend the crystalline lens by connecting it to the ciliary body.

Question 5

Where does the optic chiasm receive its blood supply primarily from?

Accepted Answer

Internal carotid artery

Answer

The optic chiasm is supplied primarily by branches of the internal carotid artery, including the anterior cerebral and anterior communicating arteries.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Ocular Anatomy and Physiology 4