I just wanted to explain a little more because I posted quickly then ran out the door.

As Minky says it can be about the way the brain processes information. I do these excercises with both my kids because DS has Sensory Processesing Disorder, and it helps the brain to sort the info properly. It's great for all kids in any case (helps AMAZINGLY with things like eye tracking) and it's also great for DD and her turned eye.

The lady that taught me has seen heaps of these eyes fix themselves. It's fun too, a bit of rolling around on the floor and on a fit ball. We do it for 15 mins per day.