Final answer:
The opening at the center of the iris is called the pupil, which regulates the amount of light entering the eye.
Explanation:
The opening at the center of the iris is called the pupil. The pupil is a circular opening in the iris that controls the amount of light entering the eye. It can adjust in size based on the ambient light conditions to regulate the light reaching the back of the eyeball.
Learn more about Eye anatomy here:
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