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This is the central circular opening in the colored part of the eye -- also called the iris. Depending on how much light there is, the iris may contract or dilate, limiting or increasing the amount of light that gets deeper into the eye. The light then goes through the lens.
The colored part of the eye around the pupil. The part of the eye that focuses light rays upon the retina. The opening in the center of the Iris that looks like a black spot. It is the only part of the eye where light can enter the eye. Its size is regulated by the expansion and contraction of the Iris.