Medically reviewed by Johnstone M. Kim, MD Key Takeaways Gray and green eye colors are the rarest in the U.S., although extremely rare red color can occur with albinism.Eye color is determined by the ...

"Hearst Magazines and AOL may earn commission or revenue on some items through these links." Human eyes come in a kaleidoscope of colors—from the palest blues of the sky to the deepest browns of the ...