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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
Human eye pigmentation in Europe Among human phenotypes, blue-green-gray eyes are a relatively rare [citation needed] eye color and the exact color is often perceived to vary according to its surroundings. The iris is usually strongly pigmented, with the color typically ranging between brown, hazel, green, gray, and blue.
Martin-Schultz scale. The Martin–Schultz scale is a standard color scale commonly used in physical anthropology to establish more or less precisely the eye color of an individual; it was created by the anthropologists Rudolf Martin and Bruno K Schultz in the first half of the 20th century.
With brown eyes taking an overwhelming lead, all of the other eye colors have lower percentages. According to WorldAtlas , 8-10 percent of the world's population have blue eyes.
The human eye can distinguish about 10 million different colors, but most of them lie outside the gamut of this image. Created with the following very short program written in Chipmunk Basic : 10 for x = 0 to 999 20 for y = 0 to 999 30 z = int ( y / 100 ) * 10 + int ( x / 100 ) 40 graphics color x , y , z ' x=red y=green z=blue 50 pset x , y 60 ...
Although the processes determining eye color are not fully understood, it is known that inherited eye color is determined by multiple genes. Environmental or acquired factors can alter these inherited traits. [7] The color of the mammalian, including human, iris is very variable. However, there are only two pigments present, eumelanin and ...
The human eye is a sensory organ ... and finally a light-sensitive part of the eye (the retina), where the images fall ... brown is by far the most common eye color, ...
The original Martin scale, summarized below, consists of 16 colors (from light blue to dark brown-black) that correspond to the different eye colors observed in nature due to the amount of melanin in the iris. The numbering is reversed in order to match the Martin–Schultz scale, which is still used in biological anthropology. In this case ...