page_title: Iris (anatomy)
hierarchical_section_title: Iris (anatomy)
caption_attribution_description: Human Iris, Blue Type
context_page_description: In humans and most mammals and birds, the iris is a thin, annular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. Eye color is defined by that of the iris. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm.
context_section_description: In humans and most mammals and birds, the iris (plural: irides or irises) is a thin, annular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. Eye color is defined by that of the iris. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm.
caption: The iris in humans is the colored (typically blue, green, or brown) area, with the pupil (the circular black spot) in its center, and surrounded by the white sclera.
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