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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.
The rate of eye evolution is difficult to estimate because the fossil record, particularly of the lower Cambrian, is poor. How fast a circular patch of photoreceptor cells can evolve into a fully functional vertebrate eye has been estimated based on rates of mutation, relative advantage to the organism, and natural selection.
According to Yelmen et al. 2019, the two main components of Indian genetic variation; the South Asian populations that "separated from East Asian and Andamanese populations" form one of the deepest splits among non-African groups compared to the West Eurasian component because of "40,000 years of independent evolution".
The cooperative eye hypothesis is not the only one that has been proposed to explain the appearance of the human eye. Other hypotheses include the proposal that white sclerae are a sign of good health, useful in mate selection, or that eye visibility promotes altruistic behaviour by letting people know they are being watched. A study by the Max ...
Phylogeny: The vertebrate eye initially developed with a blind spot, but the lack of adaptive intermediate forms prevented the loss of the blind spot. Mechanism: The lens of the eye focuses light on the retina. Development: Neurons need the stimulation of light to wire the eye to the brain (Moore, 2001:98–99).
Makeup artists say the trend is innocent enough, but many Asians say it's racially insensitive and hints at cultural appropriation.
Double eyelids are unconditionally considered beautiful in East Asian society. [13] The double eyelid is a crease in the small flap of skin that covers the eye. It has been estimated that 17–32% of Chinese women lack this upper eyelid crease, giving them a monolid appearance. [14] However, this is not ideal when it comes to Chinese beauty.
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