Hazel eyes are due to a combination of a Rayleigh scattering and a moderate amount of melanin in the iris' anterior border layer.[22][5] Hazel eyes often appear to shift in color from a light brown to a medium golden-green. A number of studies using three-point scales have assigned "hazel" to be the medium-color between the lightest shade of blue and darkest shade of brown.[34][35][36][37][38][39][40] This can sometimes produce a multicoloured iris, i.e., an eye that is light brown near the pupil and charcoal or amber/dark green on the outer part of the iris (and vice versa) when observed in sunlight. Hazel is commonly found in Europe, some regions of the Middle East, North America, parts of Central Asia, parts of North India, Northern Pakistan, Iran and in Afghanistan. Rarely, hazel eyes can be found in people of sub-saharan African, Native American and East Asian descent. A large percent of Hazel eyes have a brown ring around the iris and have either green or blue around the outside of the ring.
Definitions of the eye color "hazel" vary: it is sometimes considered to be synonymous with light-brown and gold.[41][27][34][36][39][42][43][44][45] In North America, "hazel" is often used to describe eyes that appear to change color, ranging from light brown to green and even grey, or grey to blue, depending on lighting in the environment.
Originally Posted by theninjaway
http://en.wikipedia.org/wiki/Eye_color#HazelHazel eyes are due to a combination of a Rayleigh scattering and a moderate amount of melanin in the iris' anterior border layer.[22][5] Hazel eyes often appear to shift in color from a light brown to a medium golden-green. A number of studies using three-point scales have assigned "hazel" to be the medium-color between the lightest shade of blue and darkest shade of brown.[34][35][36][37][38][39][40] This can sometimes produce a multicoloured iris, i.e., an eye that is light brown near the pupil and charcoal or amber/dark green on the outer part of the iris (and vice versa) when observed in sunlight. Hazel is commonly found in Europe, some regions of the Middle East, North America, parts of Central Asia, parts of North India, Northern Pakistan, Iran and in Afghanistan. Rarely, hazel eyes can be found in people of sub-saharan African, Native American and East Asian descent. A large percent of Hazel eyes have a brown ring around the iris and have either green or blue around the outside of the ring.
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