VisionFirst CEBT Practice Test

The cornea is best described as which of the following?

A layer of muscle that controls pupil size The inner lining of the eyelid The clear connective tissue membrane that helps focus light and provides a smooth anterior surface A vascular layer of the eyeball

Correct Answer:

The clear connective tissue membrane that helps focus light and provides a smooth anterior surface

Explanation:

The cornea is the eye’s transparent front surface that helps focus light. It’s a clear connective tissue membrane that provides a smooth curved surface, giving much of the eye’s refractive power to bend light as it enters. It’s avascular, which keeps it optically clear, with nutrients supplied from tears and the aqueous humor. This isn’t a muscle that controls pupil size, and it isn’t the inner lining of the eyelid, nor a vascular layer.

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