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A 1997 study of White Americans found that eye color may be subject to change in infancy, and from adolescence to adulthood. [24] 17% of children experienced a change of eye color from early childhood to adulthood, and of those children, 50% of developed lighter eyes as they got older. The other 50% developed darker eyes. [25]
Human skin color. Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among individuals is caused by variation in pigmentation, which is the result of genetics (inherited from one's biological parents ), exposure to the sun, disorders, or some combination thereof.
The Caucasian race (also Caucasoid, [a] Europid, or Europoid) [2] is an obsolete racial classification of humans based on a now-disproven theory of biological race. [3] [4] [5] The Caucasian race was historically regarded as a biological taxon which, depending on which of the historical race classifications was being used, usually included ancient and modern populations from all or parts of ...
Melanin is the protein that creates skin, eye and hair color. More melanin means darker eyes, hair or skin. The color of the melanin in the eyes is determined by three other genes, EYCL1, 2 and 3 ...
It occurs in humans and certain breeds of domesticated animals. Heterochromia of the eye is called heterochromia iridum or heterochromia iridis. It can be complete, sectoral, or central. In complete heterochromia, one iris is a different color from the other. In sectoral heterochromia, part of one iris is a different color from its remainder.
Health and appearance of Michael Jackson. Michael Jackson in 1977 at age 18 (left) and 1997 at age 38 (right) Michael Jackson was an American entertainer who spent over four decades in the public eye, first as a child star with the Jackson 5 and later as a solo artist. From the mid-1980s, Jackson's appearance began to change dramatically.
The iris (brown coloured portion of the eye) controls the size of the pupil by contracting the sphincter pupillae and dilator pupillae muscles. The sphincter pupillae is the opposing muscle of the dilator pupillae. The pupil's diameter, and thus the inner border of the iris, changes size when constricting or dilating.
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.