ABO NOCE Basic Opticianry Ocular Anatomy and Physiology Questions and Answers

Question 1

Which layer of the cornea constitutes approximately 90% of its thickness and is composed of highly organized collagen fibrils that are crucial for maintaining corneal transparency?

Accepted Answer

Stroma

Answer

Epithelium

Answer

Bowman's Layer

Answer

Endothelium

Question 2

A patient is having difficulty with tasks at close distances. The process of accommodation allows the eye to focus on near objects. Which of the following correctly describes the primary mechanism of accommodation?

Accepted Answer

The ciliary muscle contracts, releasing tension on the zonules, which allows the crystalline lens to become more convex.

Answer

The ciliary muscle relaxes, increasing tension on the zonules, which flattens the crystalline lens.

Answer

The iris constricts, increasing the depth of focus, which brings near objects into view.

Answer

The extraocular muscles converge the eyes, which changes the focal point of the cornea.

Question 3

Which of the following photoreceptor cells are more numerous in the human retina, are responsible for vision in low-light (scotopic) conditions, and do not perceive color?

Accepted Answer

Rods

Answer

Cones

Answer

Bipolar Cells

Answer

Ganglion Cells

Question 4

The aqueous humor is a clear fluid that fills the anterior and posterior chambers of the eye. What is its primary drainage pathway out of the eye?

Accepted Answer

Through the trabecular meshwork into Schlemm's canal

Answer

Through the vitreous humor to the optic nerve

Answer

Via the uveoscleral outflow pathway

Answer

Direct absorption by the corneal endothelium

Question 5

A client is instructed to look up and to the right during an extraocular muscle motility test. This movement primarily involves the contraction of which two muscles in the right eye?

Accepted Answer

Superior Rectus and Lateral Rectus

Answer

Superior Rectus and Medial Rectus

Answer

Inferior Oblique and Lateral Rectus

Answer

Superior Oblique and Medial Rectus

Question 6

Which transparent mucous membrane covers the anterior surface of the sclera and the inner surface of the eyelids, playing a key role in lubrication and protection?

Accepted Answer

Conjunctiva

Answer

Choroid

Answer

Retina

Answer

Cornea