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See also Retina, Iris recognition, Retinal scan, Eye vein verification, Biometric authentication

Snippet from Wikipedia: Iris (anatomy)

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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