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What Is Heterochromia?

Most of us notice a person’s eye color almost immediately when we meet them.

A striking pair of eyes can make a deep impression, and what could be more striking than a pair of eyes that don’t match? In scientific terms, that’s heterochromia, a phenomenon fairly common in cats and dogs but much rarer in humans, affecting only three out of every five hundred people. It comes in a few different varieties and happens for different reasons.