The rarest eye color in the world is green.
Only 2% of the world's population has green eyes.
Green eyes are caused by a combination of genetics and the amount of melanin in the iris.
Melanin is a pigment that determines eye color.
Green eyes have low to moderate amounts of melanin.
Blue eyes have the least amount of melanin, while brown eyes have the most.
Green eyes are most commonly found in people of Celtic or Germanic ancestry.
Green eyes can also be found in people of African, Asian, and South American descent.
Green eyes are often considered to be the most attractive eye color.