Advances in cosmetic surgery let people permanently change their eye color, and they’ll pay thousands for a new hue. Doctors ...

The eyes are truly the windows to the soul. Look into the eyes of someone you know and you can tell what they feel, what they ...

When colored contacts aren't enough, some people are paying thousands of dollars to have their eye color surgically changed.

Light helps explains the evolution of our skin color, why some of us have curly hair, and the size of our eyes. And light ...

Animals see differently than humans. Cats can navigate low-light environments, but what about their perception of color?