Contraction of which eye structure controls the amount of light that reaches the retina?

Name: Contraction of which eye structure controls the amount of light that reaches the retina?
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Question

Quizplus · Accepted Answer

The iris is able to dilate and contract, allowing light to reach the retina. The retina is deep within the eye. The sclera is not able to dilate and contract, and the lens is merely a transparent disc that acts as a focus for the retina.

Contraction of Which Eye Structure Controls the Amount of Light