Why Humans Don’t Have Black Eyes

The color of our eyes actually continues to develop and change up until we are about 3 years old. However, it’s actually impossible for human eyes to be truly black in color. Our eyes just appear to be black due to lighting, because of the reflection of the clothes we’re wearing, or the use of colored contacts.

Our genes just won’t allow it.

Why Humans Don’t Have Black Eyes

There are about 16 different genes that are responsible for the color of our eyes. 2 of these genes are major factors, which are the HERC2 and OCA2 genes. These genes fine-tune our eye color through the amount of melanin present in our irises. The resulting colors of the melanin in our eyes can range from a wide variety of hues, like blue and gray, but the darkest possible color is very dark brown, not black.

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