If you are serious about riding, you could get in trouble. Jumping, riding trails, and riding on the flat could prove to be dangerous. He can't help not being able to take care of you if he is blind. He may fall and get you hurt. He sounds like a good companion horse or maybe a horse to ride in an arena on occasion. Also, why is he blind? Does he have cancer or something that will be expensive to take care of? There are a lot of nice horses out there that need homes. If you take him on, I would look at it like a charity case. In his defense, my sister was given a blind horse several years back. He was fun to ride just so you didn't take him out into new territory. She eventually gave him to a young girl who enjoyed him tremendously. I would just be afraid that he would trip and fall.