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The irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris.
This absence results in a primarily black appearance of the central eye. Aniridia can be congenital , typically affecting both eyes, or caused by a penetrant injury. [ 1 ] Congenital aniridia is not simply an iris defect but a more complex condition affecting multiple parts of the eye, with macular and optic nerve hypoplasia , cataract , and ...
This is a list of notable people who have been documented as having heterochromia iridis, a condition when the irises have different colours. People who are frequently mistakenly thought to have heterochromia are not included, but may be listed in the Notes section.
Fuchs heterochromic iridocyclitis – a condition characterized by a low grade, asymptomatic uveitis in which the iris in the affected eye becomes hypochromic and has a washed-out, somewhat moth eaten appearance. The heterochromia can be very subtle, especially in patients with lighter colored irides. It is often most easily seen in daylight.
Unlike other primates, all human beings have eyes with a distinct colour contrast between the white sclera, the coloured iris, and the black pupil. This is due to a lack of pigment in the sclera. Other primates mostly have pigmented sclerae that are brown or dark in colour. There is also a higher contrast between human skin, sclera, and irises.
Because individuals with albinism have skin that entirely lacks the dark pigment melanin, which helps protect the skin from the sun's ultraviolet radiation, their skin can burn more easily from overexposure. [8] The human eye normally produces enough pigment to color the iris blue, green or brown and lend
This is a case for the FBI — or at least Andy Cohen. Heather Gay reveals her black eye to her Real Housewives of Salt Lake City costars in Us Weekly’s exclusive sneak peek of the Wednesday ...
A black eye is an injury. An iris of the eyes that is very dark brown may appear almost black. Special color contact lenses can be used to make the eyes appear black. Aniridia is a congenital condition in which the iris is poorly developed or nonexistent, giving the eye a black color because only the pupil can be seen. Black eye may also refer to: