Rim around the iris
December 1, 2008 12:06 AM Subscribe
Why do I have green eyes with blue rims? What causes the iris to be one color while the darker rim around it is another?
posted by Baethan to Science & Nature (4 answers total) 5 users marked this as a favorite
Out of curiosity, and not being well-versed in the sciences, I'm wondering how eyes of one color can have rims of a different color. For instance, I have green eyes with blue rims. Is this blue rim the corneal limbus I'm looking at? From a comment onthis mefi post
: "The iris contains pigment granules. Density of granules is a determinant of eye color. Some people have especially dense concentrations of granules towards the periphery of the iris. This causes the dark iris 'ring'".
No source provided. Is this true? If so, how is the iris a different color? (I was under the impression that the genes involved in the expression of blue and green eyes are different.) Does this happen with other colors as well?
Looking through pictures on google, it seems many green eyes (in particular, the ones that tend toward yellow?) have the blue rim.