Interesting... My left eye doesn't go left. I mean it will, but I have to force it. I cannot remember what exactly it's called. I was in all kinds of therapy for it, etc... I also have had the same Rx, only in that left eye, for the past 20 years. I wore reading glasses for tracking issues myself, but none of it corrected the issue with the eye itself. Now, I have an Rx in my left eye for astigmatism, hmmmmmmmmm...
My son doesn't actually use his left hand for much of anything now. But I'm guessing it could be still the issue for him.