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Genetic, ethnic affiliation, geographical ancestry. Height, body weight, skin tone, body hair, sexual organs, hair color, hair texture, eye color, eye shape (see epicanthic fold and eyelid variations), nose shape (see nasal bridge), ear shape (see earlobes), body shape; Body and skin variations such as amputations, scars, burns and wounds.
Normal eye colors range from the darkest shades of brown to the lightest tints of blue. [14] To meet the need for standardized classification, at once simple yet detailed enough for research purposes, Seddon et al. developed a graded system based on the predominant iris color and the amount of brown or yellow pigment present. [100]
The human eye can detect a luminance from 10 −6 cd/m 2, or one millionth (0.000001) of a candela per square meter to 10 8 cd/m 2 or one hundred million (100,000,000) candelas per square meter. [ 19 ] [ 20 ] [ 21 ] (that is it has a range of 10 14 , or one hundred trillion 100,000,000,000,000, about 46.5 f-stops).
Ethnic groups vary with regard to their ideal waist-to-hip ratio for women, [255] ranging from 0.6 in China, [256] to 0.8 or 0.9 in parts of South America and Africa, [257] [258] [259] and divergent preferences based on ethnicity, rather than nationality, have also been noted.
The Martin scale is an older version of color scale commonly used in physical anthropology to establish more or less precisely the eye color of an individual. It was created by the anthropologist Rudolf Martin in the first half of the 20th century.
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An epicanthic fold or epicanthus [6] is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. [3] However, variation occurs in the nature of this feature and the possession of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.
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.