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Corneal opacities (scarring of the cornea that creates an opaque or semi-transparent area on the eye) may be caused by leucoma, keratitis or cataracts. [1] Such opacities can be cosmetically disruptive for patients in their everyday lives. Tattooing the cornea can alter a discoloration, blending an opacity into the normal eye color.
Artificial irises may be implanted into people with healthy eyes to change their eye color. These cosmetic irises are marketed as an alternative to cosmetic contact lenses. Cosmetic implants are criticized by ophthalmologists as they can lead to vision loss in healthy eyes. [3]
The total number of genes that contribute to eye color is unknown, but there are a few likely candidates. A study in Rotterdam (2009) found that it was possible to predict eye color with more than 90% accuracy for brown and blue using just six SNPs. [16] [17] In humans, eye color is a highly sexually dimorphic trait. [18]
Melanin is the protein that creates skin, eye and hair color. More melanin means darker eyes, hair or skin. The color of the melanin in the eyes is determined by three other genes, EYCL1, 2 and 3 ...
Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin. Although the processes determining eye color are not fully understood, it is known that inherited eye color is determined by multiple genes. Environmental or acquired factors can alter these inherited traits. [7]
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Recent developments also include procedures that can change eye color from brown to blue. [5] [6] Before proceeding with laser surgery, the eye specialist needs to certify that the patient is a suitable candidate for the surgery and there are several factors to be considered before doing laser surgery. [7]