mihaitzateo
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I was wondering,is eye color just an adaptation at the environment?
Why I am asking this,I just saw this article from CNN,in which is told that was discovered a way to remove from melanin from your iris.
The result is blue eyes:
http://edition.cnn.com/2015/03/04/t...paign=Feed:+rss/cnn_latest+(RSS:+Most+Recent)
According to wikipedia,there is not such a thing as "blue pigment" for the eyes,just a lack of melanin in the iris:
http://en.wikipedia.org/wiki/Eye_color#Blue
"There is no blue pigmentation either in the iris or in the ocular fluid. Dissection reveals that the iris pigment epithelium is brownish black due to the presence of melanin.[30] Unlike brown eyes, blue eyes have low concentrations of melanin in the stroma of the iris, which lies in front of the dark epithelium. Longer wavelengths of light tend to be absorbed by the dark underlying epithelium, while shorter wavelengths are reflected and undergo Rayleigh scattering in the turbid medium of the stroma.[4] This is the same frequency-dependence of scattering that accounts for the blue appearance of the sky.[3]:9[6] The result is a "Tyndall blue" structural colorthat varies with external lighting conditions."
This laser procedure seems to confirm that either brown/dark eyes or blue eyes are adaptation to environment.
I think the presence of melanin in iris protects the eyes from too much sunshine,while in places were is less sunshine,blue eyes appears more often.
Why I am asking this,I just saw this article from CNN,in which is told that was discovered a way to remove from melanin from your iris.
The result is blue eyes:
http://edition.cnn.com/2015/03/04/t...paign=Feed:+rss/cnn_latest+(RSS:+Most+Recent)
According to wikipedia,there is not such a thing as "blue pigment" for the eyes,just a lack of melanin in the iris:
http://en.wikipedia.org/wiki/Eye_color#Blue
"There is no blue pigmentation either in the iris or in the ocular fluid. Dissection reveals that the iris pigment epithelium is brownish black due to the presence of melanin.[30] Unlike brown eyes, blue eyes have low concentrations of melanin in the stroma of the iris, which lies in front of the dark epithelium. Longer wavelengths of light tend to be absorbed by the dark underlying epithelium, while shorter wavelengths are reflected and undergo Rayleigh scattering in the turbid medium of the stroma.[4] This is the same frequency-dependence of scattering that accounts for the blue appearance of the sky.[3]:9[6] The result is a "Tyndall blue" structural colorthat varies with external lighting conditions."
This laser procedure seems to confirm that either brown/dark eyes or blue eyes are adaptation to environment.
I think the presence of melanin in iris protects the eyes from too much sunshine,while in places were is less sunshine,blue eyes appears more often.