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Hazel eyes are due to a combination of Rayleigh scattering and a moderate amount of melanin in the iris' anterior border layer. [4] [35] Hazel eyes often appear to shift in color from a brown to a green. Although hazel mostly consists of brown and green, the dominant color in the eye can either be brown/gold or green.
Discrimination based on skin tone, also known as colorism or shadeism, is a form of prejudice and discrimination in which people of certain ethnic groups, or people who are perceived as belonging to a different-skinned racial group, are treated differently based on their different skin tone. [1] [2]
Oculocutaneous albinism is a form of albinism involving the eyes , the skin (-cutaneous), and the hair. [1] Overall, an estimated 1 in 20,000 people worldwide are born with oculocutaneous albinism. [1] OCA is caused by mutations in several genes that control the synthesis of melanin within the melanocytes. [2]
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Early racial classification attempts measured surface traits, particularly skin color, hair color and texture, eye color, and head size and shape. (Measurements of the latter through craniometry were repeatedly discredited in the late 19th and mid-20th centuries due to a lack of correlation of phenotypic traits with racial categorization. [ 42 ] )
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Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin. Although the processes determining eye color are not fully understood, it is known that inherited eye color is determined by multiple genes. Environmental or acquired factors can alter these inherited traits. [7]
Naturally occurring red hair appears in a small minority of humans and is the rarest natural hair color, occurring in 0.6 percent of people. [2] A smaller percentage of humans, approximately 0.17 percent or 13 million, have a combination of red hair and blue eyes. [3]