The Science Behind Eye Colors

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What's the science behind eye colors.

Have you ever wondered why people’s eyes are different colors?

Eye color is a polygenic trait meaning more than one gene will influence the outcome, and these genes produce a spectrum of color differences like hazel and gray.

The way light photons are reflected from melanin pigment dictates what color someone’s eyes appear to be.

Some people have two different colored eyes, which is a rare trait in humans.

Another rarity is having more than one color in the same eye, which is known as heterochroma iridis.

This can be caused by undergoing something traumatic in early life, alteration in the expression of a genetic trait, or it can be a side effect of medications used to treat glaucoma.

Brown eyes have more melanin in them than blue eyes.

Blue photons are reflected off by the melanin in their skin while the red photons are absorbed.

The same principle applies to certain species of monkey’s colorful posteriors.

The most colorful primate is the mandrill, which is the largest non-ape primate.

They have a red and blue nose and their rears are rainbow colored.