we call him ol One Eye Appy

I find it interesting that you say the previous owner cured this habit. Biting is not a habit to be cured. It is an act of aggression. This has nothing to do with his eye. He is not pitiful, useless, crazy, or mean. He is being a horse. He has won the dominate role in the relationship. He speaks the language of horse, and you are clueless to that language. Each time he issues a subtle cue in his language telling you he doesn't like something or he wants something you miss it, and he bites to get his point across. He won the battle for the leadership role from you in the beginning, and you didn't have a clue there was even a test. Horses are herd animals. In the herd each animal has a place in the pecking order. The more aggressive horses are the highest in the pecking order. They get the best grass. They drink first. In short they are the most likely to survive. This is the nature of the horse even if it isn't running wild. Any human who doesn't know how to recognize the challenges and earn respect does not need a horse. Respect isn't earned through pain. It is earned through the ability to stand your ground and win. We obviously can't do that by the same method as the horse, so we have to use our brains, too. You are in way over your head with this horse. You need professional help before you get seriously hurt. Find someone who can earn the dominate role without resorting to cruelty. A real horseman. The leader of the herd never says, "Please, do what I'm asking you." They never give treats to get what they want done. You don't have the know how to fix this. If you did, you wouldn't be in this position.

you have to do alot of ground work with him you have to show him you are in control and he is not