What gives color to the iris of our eye? I'm NOT talking about heredity.?

The Iris is a muscle, so why does it have color? and do any of our other muscles have color like the iris?

What gives color to the iris of our eye? I'm NOT talking about heredity.?
the amount and distribution of melanin in the irises and the density of the tissue within the body of the iris determine eye color. if melanin is present only in the epithelial cells on the iris's posterior surface, the iris reflects more wavelengths of light, causing it to look blue or even green. when the same distribution of melanin occurs with denser-than-usual tissue within the body of the iris, it appears gray. when melanin is within the body of the iris as well as in the posterior epithelial coveing, the iris appears brown.
Reply:Particular proteins within the iris have a particular color due to its structure.
Reply:It's got pigments that have a variety of colors. Heredity determines the rest of that (whether you got blue/brown/black/etc eyes).
Reply:Its a protein that makes the coating of the Iris, and this protein is like a crystal and depending on how it is aligned with others of its type, it affect the reflection and absorbtion of light. This protein name is also present in our own DNA strands!


I think it is related to the Adenin, but cant remember well.


It is why some peoples have pair eyes color, which mean that the color changes depending on the incident light reaching the eyes. This is a quantum reflection phenomenon similar to the ones found in the Opal stones... Melanin help a little but cant explain all...


Edit:


Oups I just remember that this protein is responsible for the relfectivity of some animal eyes, like the cat... Nothing to do with the color... Sorry for the erronous answer...
Reply:Yes, ^ is right. But I'll explain it a little more. The major factor in eye color is the melanin. (a pigment that plays a part in protection against the sun) Generally, the darker the eye color, the more melanin there is. For an example, hazel eyes have less, green eyes have even less, and blue has the least of all.


If you have any more questions, don't hesitate to ask.
Reply:Simply it is of melanin pigment...which is the major thing that makes racial differences in hair,nails,skin and eye colors..


as they found these differences are due to the QUANTITATIVE difference between races in melanin :)
Reply:A more scientific explanation is as follows:





Our eyes see reflected light. Any object (skin, iris, paint, leaves,hair, etc) will absorb certain bands of the light spectrum and reflect other bands. What we see is the light that is reflected. Grass is green because the blades of grass absorb the other colors in the spectrum, reflecting only what you see as green. The sky is blue, dirt is brown, cars are black, red, yellow or whatever, because these objects reflect that color. Just that simple!





There you have it.


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