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Even people with the lightest blue eyes, with no melanin on the front of the iris at all, have dark brown coloration on the back of it, to prevent light from scattering around inside the eye. In those with milder forms of albinism , the color of the iris is typically blue but can vary from blue to brown.
Blue eyes are also found in southern Europe, Central Asia, South Asia, North Africa and West Asia. [57] [58] Approximately 8% to 10% of the global population have blue eyes. [34] A 2002 study found that the prevalence of blue eye color among the white population in the United States to be 33.8% for those born from 1936 through 1951.
Red–green: 8% males, 0.5% females (Northern European descent) [2] Color blindness or color vision deficiency (CVD) is the decreased ability to see color or differences in color. [2] The severity of color blindness ranges from mostly unnoticeable to full absence of color perception. Color blindness is usually an inherited problem or variation ...
Hazel eyes tend to change colors due to Rayleigh scattering—the same factor that makes the sky appear blue. This optical effect occurs in the stroma, which is a thin layer of tissue in front of ...
Waardenburg syndrome is a group of rare genetic conditions characterised by at least some degree of congenital hearing loss and pigmentation deficiencies, which can include bright blue eyes (or one blue eye and one brown eye), a white forelock or patches of light skin. These basic features constitute type 2 of the condition; in type 1, there is ...
Nazi racial theories considered the "purest stock of Aryans" the Nordic people, identified by physical anthropological features such as tallness, white skin, blue eyes, narrow and straight noses, doliocephalic skulls, prominent chins, and blond hair, including Scandinavians, Germans, English and French, [95] [96] with Nordic and Germanic people ...
Their combined population in these territories exceeds 2.5 million, with an estimated population in Niger of around 2 million (11% of inhabitants) and in Mali of another 0.5 million (3% of inhabitants). [1][26] The Tuareg are the majority ethnic group in the Kidal Region of northeastern Mali.
The genetic history of the British Isles is the subject of research within the larger field of human population genetics. It has developed in parallel with DNA testing technologies capable of identifying genetic similarities and differences between both modern and ancient populations. The conclusions of population genetics regarding the British ...