ABO NOCE Basic Opticianry Ocular Anatomy and Conditions 3

Question 1

The optic nerve exits the eye at a point called the:

Accepted Answer

Optic disc

Answer

The optic disc (blind spot) is where the optic nerve fibers converge and exit the eye, containing no photoreceptors.

Question 2

Which photoreceptors are primarily responsible for color vision?

Accepted Answer

Cones

Answer

Cones are concentrated in the macula and fovea and contain photopigments sensitive to red, green, and blue light for color discrimination.

Question 3

The cornea receives its nutrients primarily from which source?

Accepted Answer

Aqueous humor and tears

Answer

The avascular cornea relies on aqueous humor for posterior nutrition and the tear film and limbal vessels for anterior nutrition.

Question 4

Which condition involves the lens of the eye becoming progressively opaque?

Accepted Answer

Cataract

Answer

A cataract is a clouding of the crystalline lens that reduces light transmission and causes blurred, hazy vision.

Question 5

The sclera transitions to the cornea at a boundary zone known as the:

Accepted Answer

Limbus

Answer

The limbus is the transitional zone between the opaque sclera and transparent cornea and also contains stem cells for corneal regeneration.

ABO NOCE Basic Opticianry Practice Test