Iris (anatomy)
Colored part of an eye / From Wikipedia, the free encyclopedia
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This article is about the part of the eye. For other uses, see Iris (disambiguation).
The iris (pl.: irides or irises) is a thin, annular structure in the eye in most mammals and birds, responsible for controlling the diameter and size of the pupil, and thus the amount of light reaching the retina. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm. Eye color is defined by the iris.
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