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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. [ 3 ]: 9. In humans, the pigmentation of the iris varies from ...
Melungeon (/ m ə ˈ l ʌ n dʒ ən / mə-LUN-jən) (sometimes also spelled Malungean, Melangean, Melungean, Melungin [3]) was a slur [4] historically applied to individuals and families of mixed-race ancestry with roots in colonial Virginia, Tennessee, and North Carolina primarily descended from free people of color and white settlers.
The human eye is a sensory organ in the visual system that reacts to visible light allowing eyesight. Other functions include maintaining the circadian rhythm, and keeping balance. Arizona Eye Model. "A" is accommodation in diopters. The eye can be considered as a living optical device. It is approximately spherical in shape, with its outer ...
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 ...
Category. v. t. e. The Aryan race is a pseudoscientific historical race concept that emerged in the late-19th century to describe people who descend from the Proto-Indo-Europeans as a racial grouping. [1][2] The terminology derives from the historical usage of Aryan, used by modern Indo-Iranians as an epithet of "noble".
Mediterranean race is shown in yellow; green indicates the Alpine race; bright red is the Nordic race. During the 20th century, white supremacists and Nordicists in Europe and the United States promoted the merits of the Nordic race as the most "advanced" of all the human population groups, designating them as the "master race".
Red–green: 8% males, 0.5% females (Northern European descent) [2] Color blindness or color vision deficiency (CVD) is the decreased ability to see color or differences in color. [2] The severity of color blindness ranges from mostly unnoticeable to full absence of color perception. Color blindness is usually an inherited problem or variation ...
Albinism is a congenital condition characterized in humans by the partial or complete absence of pigment in the skin, hair and eyes. Albinism is associated with a number of vision defects, such as photophobia, nystagmus, and amblyopia. Lack of skin pigmentation makes for more susceptibility to sunburn and skin cancers.