What evolutionary advantage would eye color be?

Do the different eye colors make any kind of difference or are they just for appearance? Why would there be so many different eye colors and why would they ever vary? Does the difference in color have anything to do with vision? Or is it just a aesthetic preference?What evolutionary advantage would eye color be?
Blonde hair and blue eyes developed in the Northern European continents. The lighter your skin, hair, and I suppose, eyes, the more you blended in with the environment, which tended to be snowier for a longer period of time during the year.


Whereas, brown eyes where the more generic, or base color.


And if someone with brown eyes mates with someone with blue eyes, some of the children may have green eyes.


Hazel may also spring forth, as well as grey. That would explain the variation. That is my learning of it anyway.What evolutionary advantage would eye color be?
Brown eyed people seem to be more focused on the Earth, green eyed on the things of the Earth, blue on ideas/nonrealistic idealism/impractical religion
eye color is correlated with skin and hair color. for people in europe, light skin was advantageous. so to accompany the lack of pigment, people in europe also haid fair hair and blue eyes. in africa dark skinned people had more pigment, thus making their eyes brown or black.
It depends on environment pressures....so seeing the geographical correlation between skin color and eye color I would say it has the same effects as skin, melanin is there to regulate Vitamin E and D production levels in accordance with sunlight.





EDIT: i see I've been beaten to the punch. Forgot a few things: Darker skin/eye = more melanin. Vitamin E and D are photosensative, E is destroyed by sunlight. Vitamin D is found in places with less sunlight (and thus lighter skin/eye color/hair) and darker skin is set to protect against Vitamin D poisoning.