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It’s because of changes in a light-reflecting tissue layer behind the retina, according to Science. “This structure, called the tapetum lucidum (Latin for ‘bright tapestry’), gives the eye’s light-sensitive neurons a second chance to detect scarce photons in low-light conditions. (The layer also produces the ‘eye shine’ that can make animal eyes appear to glow in the dark.)” In other words, it makes the eyes extremely sensitive to light.
“This is the first time a color change of this kind in the eye has been shown in mammals,” he added.
the magnificent ways nature protects the animals, plants and planet itself.
Decades ago, the assumption was that people, over the course of many eons, became blue eyed because they were adapting to conditions as they migrated north. The thinking was that possibly, blue eyes conferred some kind of protection against snow blindness. Even without the finding from the researchers from Copenhagen, this idea was debunked long ago. Brown eyes, because of the melanin, offer much better protection against ultraviolent light. They become even more valuable the higher you climb. Intensity of UV rays increase 4% for every 1000 feet of elevation gain.
Since individuals pushing north were confronted with darker skies and longer nights, it was considered possible that blue eyes offered better eyesight in these conditions. This has been disproved also. Most scientists consider the mutation to be nothing more than a random shuffle. Our human genome is always trying out different variations, looking for better traits. But if brown eyes offer better protection, why didn't blue eyes mutate back to brown ?
reply to post by soficrow
I also don't think that different eye colors see things the same. We are taught that green is green, aqua is aqua, red is red, etc.... So is the person with green eyes seeing things the same as those with brown eyes? Not necessarily, just because we have been conditioned to give the same response for the color does in no way mean that we are seeing it the same.