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Eye color is a polygenic phenotypic character determined by two distinct factors: the ... Blue eyes with a brown spot, green eyes, and gray eyes are caused by an entirely different part of the genome.


Eye color develops from iris pigmentation and the scattering of light. ... Other causes can be inflammation, freckle (diffuse nevus) of the iris and Horner's ...


Discover what determines eye color, how eye color changes, and learn what superstitions exist about your eye pigmentation. Learn the mysteries behind eye  ...


A person's eye color results from pigmentation of a structure called the iris, which ... which causes very light-colored eyes and significant problems with vision.


Jun 26, 2013 ... The colour of human eyes is determined by the pigmentation present and the scattering of light. Variance in the colour and density of the ...


The density of the pigmentation determines eye color along a continuum ... These causes of iris lightening are not uncommon in middle-aged or elderly persons.


Eye color in humans varies from very light to very dark. Eye color should more accurately be called iris color, since the iris, the central part of the...


Aug 23, 2016 ... When the pupil changes size, the pigments in the iris either compress or spread apart, which causes a slight change in perceived eye color.


Sep 23, 2010 ... Eye color is the result of variations in the amount of melanin, ... Let's look at a couple of ways that these new genes might cause green eyes.