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 ...

Eye colors are unique to each person. But they tend to fall into three main categories: brown, blue, and green. ‌ Brown eyes. Scientists have found that at one time, everyone had brown eyes.

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.

Gray eyes are a less common eye 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 ...

The new color ... eyes, who, afterwards, claimed to have seen a color no human has seen before. The color, which scientists call "olo," is something of an extremely saturated blue-green.