Why are eye balls different in colours?

Question

Why are eye balls different in colours?

Answer 1

The iris,the colored part, has pigment cells in its stroma. The more pigment cells the darker and more brown the eye appears. The less pigment it has,the more blue it appears. The blue color is a result of light scattering,the same as a blue sky.

Answer 2

I don't know, but, I love my green ones!

Answer 3

idk

Answer 4

I know, it's so damned frustrating.  I've got five whole buckets here, and you'd think at least TWO would match so I could finish my human-suit!!!

Back to the cemetery........

Answer 5

it's in the genes, it would be pretty boring if they were all the same.

Answer 6

the same way skin and hair are

Answer 7

Genetics.

Answer 8

http://answers.yahoo.com/my/my;_ylt=AtAD...