Heterochromia

"In anatomy, heterochromia refers to a difference in coloration, usually of the irises but also of hair or skin.

Heterochromia (also known as a heterochromia iridis or heterochromia iridium) is an eye condition in which one iris is a different color from the other (complete heterochromia), or where part of one iris is a different color from the remainder (partial heterochromia or sectoral heterochromia)."

In Wikipedia.

I chose this picture for this group's icon because i loved it so much. I find that brown and that green very unusual, bright, strong, vivid, very beautiful. And he looks like a cute kid, too, so... ;-)