I was thinking about this. Don't ask me why, it just seemed like an important
question at the time. Why are your eyes coloured? It's not as if you see in that shade, right? I don't see in a shade of brown.
My mum doesn't see in a shade of, ah, hazel. Finally, after much research (okay, none), I decided upon the answer: We'd just
look really weird without colour in our eyes. Think about it.