what is the purpose of eye color?

Because the topic is colour OF eyes, and as Asguard has said the colour of the iris doesn't affect what colours you see.

 

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ah I , took the thread to mean , what is the purpose of " seeing in colour "

if I'm wrong , carry on !

 

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There was a thread on this a while ago, and SAM found an interesting article on a possible sexual selection mechanism: since eye colors other than brown all seem to have arisen in the same general area of central Europe, the speculation (with evidence of various kinds) was that an unusual dependence on long distance big game hunting toward the end of the last ice age caused (for a variety of reasons) a unique situation in human evolution: a scarcity of male sexual attention backed by capability of providing for a child - a situation in which women actually competed for a limited availability of men, with the survival of the child on the line, no real contribution toward the male advantage to offer, a genetic variability reinforced by the importance of light skin for vitamin D, and heavy clothing or body coverings normal much of the year. In this situation, startling, unusual, or otherwise attractive eye color was genetically closer, and could provide a Darwinian edge.

Once available in the gene pool, the advantages of taht attractiveness could take on all the traditional roles - everything from Zahavian handicap to male lek leverage to demonstration of fatherhood.

 

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The genetics of skin color and eye color is fairly complex; many genes are involved. However, from a quick internet search the genes HERC2 and OCA2 plays a role in both skin color and eye color.

Except for the tropics, where dark colored skin/hair/eyes used to confer a competitive advantage over lighter colors, I suspect eye color didn't really matter all that much in terms of whether someone lived long enough to have grandchildren.

Eye color matters a lot in terms of what finicky and faddish people happen to deem as sexy/ugly in the opposite sex. A brown-eyed male born in a society where blue eyes males are just too cute: Tough luck Charlie. A blue-eyed female born in a society where blues eyes are seen as sickly or tainted: Spinster Auntie.

 

Yes, it's the light.

 

Enmos, unlikly. I grew up with her rember. I saw her constantly in every light and it wasnt green in this light, blue in that. They actually changed constantly in the same light

 

I find this very hard to believe. Take photographs of her eyes periodically with the same camera, in the same room, with the same lighting and from the same angle and place (both the camera and the subject.
Lets say one photograph every two weeks and post them here after one year.

 

you win, good sir!

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(if this is true)