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hhanan:

What part of the eye contains muscles that regulate the amount of light that is allowed to enter the eye?

ZombieLover:

The iris contains muscles that allow the pupil to become larger (open up or dilate) and smaller (close up or constrict). The iris regulates the amount of light that enters your eye by adjusting the size of the pupil opening. ( VisionAwarevisionaware.org )

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