I competed a horse that was almost blind in one eye. She had uveitis and was fine. We event3d, did jumpers and she was amazing. Only when her second eye began to go was when she was retired and sadly, put down when she lost her sight as she was too scared and hurting herself.
I know a lot of horses who are blind in one eye and are perfectly functional (jumping included)! they notice more then a regular horse and are more cautious (IMO) just do a lot of work going the way he's blind on and work on him knowing where his feet are!
Of course! Look up Endo the blind. He's totally blind in both eyes. In fact he doesn't have any eyes. He and his owner still go to shows and do performances . You should try to contact her.
I don't really know much about this but at Olympia last year there was a horse that had completley lost its left eye doing Grand Prix showjumping (jump offs and all)
I guess if that's possible almost any thing is
Half blind horses are pretty self sufficient as they become even more in tuned to their hearing. You may just want to be more cautious around them and give them vocal warnings when passing on their impaired side.
I rode a horse with moon blindness, and we didn't know how bad it was for years... his owner was treating him for a bunch of different eye problems. I was riding him at level four dressage moves when he was totally blind in one eye and losing his vision in the other. He hadn't had any behavioral changes :)
Sometimes, depending on the situation, try to have his eye for him! But if your horse looks happy, I don't think there's a reason to bother!