We had this question about a month ago on fluther and it has a lot of interesting answers. delirium provided the name for it there.
After that discussion, during that discussion, I noticed that my green eyes now had a brown color around the iris, I had it checked out and he said it was a yellowish fluid in my eye that occurred with aging. He said it was nothing to worry about now (in my case) but he noted it on my chart and would watch it in the future and that I was right to get it checked out.
As for your blue eyes, two brown-eyed parents can have a blue eyed child because blue is recessive, and they can each have a “hidden gene” of blue (notice I didn’t say blue gene, I see AC is here and is always sharp as a tack) along with their dominate brown gene. You just got the two recessive genes.
I was born with blue, they changed to grey, then green and have gotten progressively more green as I have aged. The blue eyed members of my family have the same characteristics of AC and rob. I buy my son’s and husband’s shirts and ties to purposely bring out those killer blue eyes. One has clear blue, the other cornflower. The clear blue are from my side of the family. My son’s eyes looked brown when he was born because he was a very early preemie.
sorry lemur, I proofed and saw you had already provided the link