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 ...

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

Many animals, including humans, rely on their eyes to detect changes in their surroundings. The eyes of vertebrates, animals ...