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 ...

Your eyes can tell you more about your health than you may realize. For instance, your risk of losing your hearing may be ...

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

You're introduced to someone and your attention catches on their eyes. They might be a rich, earthy brown, a pale blue, or the rare green that shifts with every flicker of light. Eyes have a way of ...