About one percent of people worldwide can ... rare genetic trait that endows people, primarily women, with a fourth color-detecting cone in their retinas. Most humans have three cones in their ...

A color as enigmatic as a well-kept secret Gray eyes have a certain something ... and originality. People who possess this unique color can be proud to bear such a rare and precious trait.

A new surgical procedure to permanently change eye color is gaining traction in the U.S. But many ophthalmologists fear ...