Well I guess I should correct myself and say it is my observation that Leopard appys get it more, I have a friend who breeds appys and every one of her older leopard appys has developed moonblindness. I would suspect it might have something to do with their color, or I guess it could be coincidence. Usually you can tell if your appy is foundation by its head and hair. The bigger the head, thinner the tail, and less quarter horse the body looks, the more foundation your appy is. I would post pictures, but I don't have any good full body shots. Good luck on your search!