An iris with the least melanin will appear blue, while those with a little more melanin may appear green or hazel. Scientists used to think that just one gene determined eye color, and that brown ...

The new color, "olo," is a hyper-saturated version of blue-green Getty Scientists conducting ... stimulated retina cells in participants' eyes, who, afterwards, claimed to have seen a color ...

While they may look similar to blue eyes, they often have a silvery or smokey appearance, sometimes with hints of green or hazel. Only about three percent of people worldwide have this rare eye color.

Generally, the eye change colors available are blue, brown, green, gray, taupe, honey and sand. The Guardian reported that patients most often are changing their eyes from brown to a different color.