I'd have to go way back in time to answer that question. Here's one, his name is Sam Langford. He was a terrific fighter and had a tremendous punch. He lost sight in one eye, perhaps a detached retina and almost all of his vision in a fight against a guy named Tiger FLowers. Here's the good part-- even with his sight gone, he didn't quit, instead he waited for his man to come in. The moment that he felt his opponent was in range he put everything he had in a tremendous right hand chop and down his opponent went with a ghasp and a thud. He kep on fighting after that, mind you that he couldn't see in one eye, and in the other barely pick up blurs and shadows. He had a couple neat stories of guys he kayoed after, but he took most of his losses during that period too. Even with surgery he became totally blind. He wasn't forgotten, people would give him donations, throw him parties, and later he'd end up in the boxing's hall of fame.