Brown eyes are the most common in the world compared with blue and green. This may be the world's most prevalent eye color — approximately 79% of the world population has some shade of brown ...

While not the rarest, hazel eyes are also not the most common eye color around. Blue-eyed folks may be rarer, but their eye color has a fascinating history. All blue-eyed people can trace their ...

The exact cause remains to be determined, but scientists do know that eye color began to ... HERC2 turns off OCA2, meaning it turns off the brown and reveals the blue. Every blue-eyed person ...