We are 4 for 4 on school kids with glasses now. At the eye doc the other week, I heard him ask my kid who gets headaches whether he gets double vision, and he said yes.
That would have been great to know any time, kid!
I knew he needed a new prescription as soon as they could get us in, but it's really something the things they don't think to tell us until asked directly. One of mine used to always get in trouble in school for copying slowly off the board...not nearsighted, but her eyes lost focus for a second every time she switched distances back and forth.
We do the colored light therapy, too. It seems to have really helped, though I have a friend who thinks the results of the other exercises stick better.
I figure we'll keep trying all of it, because it affects so much. Our doc sends stuff home, so it's not like paying through the nose for a million appointments, just the exams and follow up.