Eye color is a puzzling phenomenon. Why do people have different eye colors and why are some people attracted to some eye color over others? While we still have no solid answer to these questions, there are several theories and studies that point towards the sun having a substantial affect on the genes that govern eye color. One speculation theorizes that eye color is directly related to the emotional health of populations by allowing them to better receive the proper amounts of light needed for maintaining productive moods. According to the “Out of Africa” theory that suggests that humans evolved in Africa, dark eyes and skin were genetically selected to help block out the harmful effects of the sun’s rays. As humans began to migrate towards Europe, they began to experience shorter, dimmer days and natural selection was able to relax on the need for excess melatonin. Blue eyes are better able to take in light than dark eyes. Being exposed to more or less light at different frequencies has a decisive affect on the body’s circadian rhythm and can cause disruptions in the sleep cycle and depression or anxiety. Some theories hypothesize that men are instinctively attracted to the typical blonde hair/blue eyes combination in women because it is reminiscent of youth, making a woman seem more reproductively fit. While it is difficult to determine why exactly there is such a vast gradient in eye color, it is clear that people living closest to the equator usually have darker eyes than those experiencing extended darkness near the poles, so it seems that there is some validity in a study suggesting eye color has a lot to do with sunlight.
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