I don't think you being blind will cause too much trouble, so long as your horse follows your body. One can always turn their head to look around.
I am near sighted.. I wear glasses. If I put them on before I go to the barn, my horse knocks them off. If I put them on before I mount him, he doesn't have time to knock them off (apparently he likes me without them, LOL) I actually rode a greenie mare that KNEW when I wasn't wearing glasses because she'd try to toss me off when I didn't wear them and when I did she'd pipe down. It was bizarre.
But it doesn't impede my riding at all. Just makes everything feel surreal and dream-like instead of being in reality :P
"Strength is the ability to use a muscle without tension"