Wong told Newsweek: "In addition, what gives blue and green eyes their color is not actually blue or green pigment but the reflection of light within the eyes (Rayleigh scattering) and lipofuscin ...

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 ...

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.

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.