For most of human history, green eyes didn’t exist. Understanding why they do now means rethinking what we know about evolution itself.

There are a lot of different colored eyes out there and, sort of like a snowflake, no two eyes are exactly the same. In fact, even if you have the same color eyes as your family or friends, there ...

Blue, green, amber: Someone’s eye color immediately attracts our attention. But there’s something unusual about human eyes: We have a large visible area of white that surrounds the iris. Most other ...

Gray and green eye colors are the rarest in the U.S., although extremely rare red color can occur with albinism. Eye color is determined by the amount of melanin in the iris, with more melanin making ...

UAB optometry expert Janelle Sventek explains what determines a child’s eye color, why it can change in infancy, how genetics ...