currently, I have 4 kids. 3 got glasses (for all different eye issues!) by age 3!. I had strabismus (patched at about age 2). I needed glasses at about age 14.
Well, 2 of the 3 kids with glasses have strabismus. One's eyes go outward slightly (both eyes). She has eye exercises to try. The other's right eye turns inward to a horrifying extent, mostly without her glasses.
If you are seeing an optometrist for it, switch to a pediatric opthalmologist. There are only a few within an hour of me, and of those, only 2 are really recommended. It takes about 9 MONTHS to get in with them.
If you have any questions, or just need to talk to someone, lmk!
Beth