Yeah, he's only been able to see out of one eye since 67 according to the Thrilla in Manila documentary. Didn't Julian Jackson have eye trouble as well, not sure how long into his career he had that.
I know that there was some talk about his eye problems before the Herol Graham fight. I'm not sure if it was his good eye that was completely swollen, in case it was then that would only make his dramatic comeback KO even more impressive.
Absolutely! A remarkable accomplishment... And having a "custom-made" (plate sewn in) foul protector.