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2. Eye color - Wikipedia

   en.wikipedia.org/wiki/Eye_color

   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. [ 3]: 9. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in ...

3. Heterochromia iridum - Wikipedia

   en.wikipedia.org/wiki/Heterochromia_iridum

   Heterochromia iridum. Heterochromia is a variation in coloration most often used to describe color differences of the iris, but can also be applied to color variation of hair [ 1] or skin. Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment ). It may be inherited, or caused by genetic mosaicism ...

4. Iris (anatomy) - Wikipedia

   en.wikipedia.org/wiki/Iris_(anatomy)

   Among human phenotypes, blue-green-gray eyes are a relatively rare [citation needed] eye color and the exact color is often perceived to vary according to its surroundings. The iris is usually strongly pigmented, with the color typically ranging between brown, hazel, green, gray, and blue.

5. Limbal ring - Wikipedia

   en.wikipedia.org/wiki/Limbal_ring

   Limbal ring. 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 ...

6. Martin–Schultz scale - Wikipedia

   en.wikipedia.org/wiki/Martin–Schultz_scale

   The Martin–Schultz scale is a standard color scale commonly used in physical anthropology to establish more or less precisely the eye color of an individual; it was created by the anthropologists Rudolf Martin and Bruno K Schultz in the first half of the 20th century. The scale consists of 20 colors [ 1] (from light blue to dark brown-black ...

7. Blue-gray - Wikipedia

   en.wikipedia.org/wiki/Blue-gray

   Blue-gray. Livid is a medium bluish - gray color. This color name comes from the Latin color term lividus meaning "'a dull leaden-blue color', and also used to describe the color of contused flesh, leading to the English expression 'black and blue'". [ 1] The first recorded use of livid as a color name in English was in 1622.

8. Color blindness - Wikipedia

   en.wikipedia.org/wiki/Color_blindness

   Rarer genetic conditions causing color blindness include congenital blue–yellow color blindness (tritan type), blue cone monochromacy, and achromatopsia. Color blindness can also result from physical or chemical damage to the eye, the optic nerve, parts of the brain, or from medication toxicity. [2] Color vision also naturally degrades in old ...

9. Argyria - Wikipedia

   en.wikipedia.org/wiki/Argyria

   Argyria or argyrosis is a condition caused by excessive exposure to chemical compounds of the element silver, or to silver dust. [ 1] The most dramatic symptom of argyria is that the skin turns blue or blue-gray. It may take the form of generalized argyria or local argyria. Generalized argyria affects large areas over much of the visible ...