Limbal ring
Dark ring around the iris of the eye / From Wikipedia, the free encyclopedia
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A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea.[1] It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region.[2] The appearance and visibility of the limbal ring can be negatively affected by a variety of medical conditions concerning the peripheral cornea.[3] It has been suggested that limbal ring thickness may correlate with health or youthfulness and may contribute to facial attractiveness.[3][4] The thickness of the limbal ring varies by pupil dilation - when the pupil is larger, the limbal ring narrows.[5] Some contact lenses are colored to simulate limbal rings.[1]