Using an experimental technique called "Oz," researchers stimulated the human retina such that people saw a brand-new color.

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

Sectoral (or partial) heterochromia: Here, a single eye displays multiple shades. Part of the iris may be a different color than the rest. For example, a green iris with a hazel patch. This ...