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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.
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.
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 irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [3]: 9
Ethnic classifications vary from country to country and are therefore not comparable across countries. While some countries make classifications based on broad ancestry groups or characteristics such as skin color (e.g., the white ethnic category in the United States and some other countries), other countries use various ethnic, cultural ...
The pupil of the human eye can range in size from 2 mm to over 8 mm to adapt to the environment. 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.
Muscles around the iris change the size of the pupil, regulating the amount of light that enters the eye [3] and reducing aberrations when there is enough light. [4] The eyes of most cephalopods, fish, amphibians and snakes have fixed lens shapes, and focusing is achieved by telescoping the lens in a similar manner to that of a camera. [5]
The majority of Chinese living in Italy are from the city of Wenzhou in the province of Zhejiang. [78] Breaking down the foreign-born population by continent, in 2020 the figures were as follows: Europe (54%), Africa (22%), Asia (16%), the Americas (8%) and Oceania (0.06%).