Margaret, does your son fully understand that he needs to be concentrating on seeing things with his week eye? Things like trying to focus on large letters, at different distances? I went through this as a kid (still essentially blind in one eye) with the patches, and they kept repeating “you’ve got a lazy eye”, but I never got the notion of what I was supposed to do with it (boy, was I angry when it occurred to me in my teens, “too late”, as I was then told!). I can’t promise it’ll make any difference, but it should be worth trying! Isn’t it annoying that they mention their app/video game, but don’t provide a link to it: I want to try it right now, not after trolling the net, possibly unsuccessfully!