I have raised birds for over 11 years and in that time I have delt with all kinds of deformaties with chickens. I have seen things that would freak most people out, but I have always kept them or got them form people who wouldnt take care of them, and make them my pets. I have only had one blind chicken tho. He was a beautiful White Cochin Bantam cockerel. Very nice, actually showed him and he done pretty well to be blind. He stayed with other birds and he mated fine,...granted it took him a litle longer to get the job done than a male that could see,...but I raised a few chicks from him. None of them turned out to be blind. He ate fine, drank fine, mated fine, done everything a normal bird did,...just bumped into things more often and stumbled over things more easily. I eventually sold him to a friend on the other BYC board in Tx and she loved him. I think he eventually got picked off by a predator sadly. But he was over a year old before he was killed. I think I might have a picture of him somewhere actually.
~Casey