Hi there. My 9 year old cat started out with one of these freckles in his left eye was he was a kitten. About 3 years ago it started to take over his eye and about a year ago his eye turned completely brown. Everyone in the vet's office was in awe that it did that but he is completely healthy. The vet did tell me to keep an eye on his eye for any other changes including any cloudiness when looking through his eye in the light or any other kinds of spots. To date there still have not been any problems and he is still his healthy little energetic self.