We just had my daughter's check up on Friday after wearing glasses for 6 months due to being farsighted. Her prescription increased from +4.5 to +5.75 in the left eye, and +4.75 to +6.0 in her right eye. We were a little worried about the fact that her prescription is getting worse, though her eye doctor wasn't concerned. So I did a bit of searching in the medical literature and found this article:
Longitudinal changes in the spherical equivalent refractive error of children with accommodative esotropia.Basically, the study found that children's prescription get worse at first, and then start to get better. For kids that are diagnosed before 2 years, their prescriptions get worse for longer before getting better, and the amount of improvement is less. For my daughter (who got glasses at 14 months, but first showed signs of crossed eyes at 9 months), it means that while her prescription will likely get better in a few years, she'll probably always need glasses. Which is fine, I guess, since everyone in her immediate family - parents, grandparents, aunts and uncle - all wear glasses. She'll fit right in.