ABO NOCE Basic Opticianry Ocular Anatomy and Conditions Questions and Answers 4

Question 1

Which cells in the retina are responsible for contrast detection and are activated by differences in illumination across adjacent areas?

Accepted Answer

Horizontal cells

Answer

Horizontal cells laterally connect photoreceptors and bipolar cells, enabling contrast enhancement through lateral inhibition.

Question 2

A patient presents with loss of the temporal visual field in both eyes. The lesion most likely involves the:

Accepted Answer

Optic chiasm

Answer

Bitemporal hemianopia is the classic presentation of an optic chiasm lesion affecting the crossing nasal fibers from both eyes.

Question 3

Keratoconus is best described as:

Accepted Answer

Progressive thinning and conical protrusion of the cornea

Answer

Keratoconus is a degenerative disorder causing progressive corneal thinning and conical ectasia, leading to irregular astigmatism.

Question 4

The space between the cornea and iris is referred to as the:

Accepted Answer

Anterior chamber

Answer

The anterior chamber lies between the posterior corneal surface and the anterior iris/lens surface and is filled with aqueous humor.

Question 5

Which condition causes cobblestone papillae under the upper eyelid and is linked to allergen exposure?

Accepted Answer

Vernal keratoconjunctivitis

Answer

Vernal keratoconjunctivitis is a severe allergic condition featuring giant cobblestone papillae on the tarsal conjunctiva.

ABO NOCE Basic Opticianry Practice Test