The condition at age five, when I saw him, was alternating esotropia with little change in performance. After a non-verbal examination, he was given ambient lenses. Two months later his eyes were aligned. Another problem which is common in autism and sometimes involves surgery is toe walking. From my experience working with you, it appears that, for many, toe walking may simply be due to a visual dysfunction.
Nothing is simple.
There are many postural changes that are due to visual management, one happens to be toeing in. If you can change their visual emphasis, they may not need so much energy to manage it and could start to pay more visual attention to themselves. Dr. Richard Herman, an Orthopedic Surgeon, has written that idiopathic scoliosis is probably due to a visual perceptual problem. It has been my experience that posture changes can be elicited through visual management training. For example, toeing in while walking is a visual perceptual problem, the failure to be aware of self and space simultaneously.