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    With regard to human eyes, does the colouration of the iris serve any purpose, and do different colours have any significance?

    Question #51884. Asked by Linus_337. (Oct 23 04 6:16 AM)


    sue943

    		It is down to melanin. If you have a lot of melanin in your irises, your eyes will appear brown or black. If you have very little, your eyes will appear blue. Intermediate amounts of melanin produces grey, green, hazel or varying shades of brown eye colour.

    From the BBC website.

    Oct 23 04, 7:24 AM
    mikeBarr81

    		I would imagine that if it's down to melanin then the colour of the eye serves to protect it against UV radiation as does dark skin. I would think this is why the closer to the equator you are the darker the native people tend to be.

    Oct 23 04, 2:08 PM
    TheAlphaWolf

    		yes... you also need a certain amount of UV radiation for you to use vitamin D so that's why upper-latitude people are lighter.

    Oct 23 04, 6:42 PM

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