My son who is ten has the same problem, we took him to the hospital and they said there are two ways to deal with his eye, one is if it gets bad then surgery ( we really didnt want this) or two he can do it himself, he has to concentrate and make his eye straight ! after a while it will become a habit and he will be fine, so we taught him how to do it and now only if he is really tired or forgets then it will wander back and we all shout JOSH YOUR EYE CONCENTRATE ! He laughs and concentrates again......

Trish.