Thanks so much for the responses! I actually had taken him to the vet previously, but she thought that it might just be abnormal coloration, and she said that he still had sight in the eye. However since then it seems like its getting worse (darker). I will take him back again soon, but surgery is not an option for me at this time. He still eats very well, and seems happy, so i guess ill just have to see what happens. Thanks again for the help!