Certified Paraoptometric (CPO) Practice Exam 2026

Question: 1 / 420

What describes the conjunctiva?

A thin layer covering the retina

A clear, cellophane-like tissue covering the sclera

The conjunctiva is a clear membrane that serves as a protective layer covering the sclera (the white part of the eye) and lining the inside of the eyelids. This tissue plays several important roles, including lubrication of the eye by producing mucus and tears, as well as serving as a barrier to protect the eye from pathogens and foreign material. By describing it as a clear, cellophane-like tissue covering the sclera, it accurately captures the essential characteristics and functions of the conjunctiva.

The other options pertain to different structures and functions within the eye. For instance, the retina is the light-sensitive layer at the back of the eye, and it is not covered by the conjunctiva. A muscle that controls eye movement refers to the extraocular muscles, which are not related to the conjunctiva. Lastly, the area where light is focused in the eye refers to the lens and cornea's roles, rather than the conjunctiva itself.

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A muscle controlling eye movement

The area where light is focused in the eye

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