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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 presence of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.
Pseudostrabismus is more likely to be observed in East Asian or Native American infants, due to the presence of epicanthic folds obscuring the medial aspect of each eye. Pseudostrabismus generally occurs in infants and toddlers, whose facial features are not fully developed.
Epicanthic eye folds are believed to be an adaptation protecting the eye from overexposure to ultraviolet radiation, and is presumed to be a particular trait in archaic humans from eastern and southeast Asia. A cold-adaptive explanation for the epicanthic fold is today seen as outdated by some, as epicanthic folds appear in some African ...
Epicanthic folds are more common in Native Americans than most other populations in the world beside East/South East Asians. BUT, the occurance of epicanthic folds in Native Americans is much less prominant than with East Asians. They tend to be most common among indigenous of the northern most populations/tribes.
Schematic illustration of maternal (mtDNA) gene-flow in and out of Beringia, from 25,000 years ago to present. The genetic history of the Indigenous peoples of the Americas is divided into two distinct periods: the initial peopling of the Americas from about 20,000 to 14,000 years ago (20–14 kya), [1] and European contact, after about 500 years ago.
A map showing the origin of the first wave of humans into the Americas, including the Ancestral Northern Eurasian, which represent a distinct Paleolithic Siberian population, and the Northeast Asians, which are an East Asian-related group.
A map showing the Hernando de Soto expedition route through Ocute and other nearby chiefdoms. Based on Charles M. Hudson's 1997 map. Ocute, later known as Altamaha or La Tama and sometimes known conventionally as the Oconee province, was a Native American paramount chiefdom in the Piedmont region of the U.S. state of Georgia in the 16th and 17th centuries.
Native American migration to urban areas continued to grow: 70% of Native Americans lived in urban areas in 2012, up from 45% in 1970, and 8% in 1940. Urban areas with significant Native American populations include Rapid City, Minneapolis, Oklahoma City, Denver, Phoenix, Tucson, Seattle, Chicago, Houston, and New York City. Many have lived in ...