My DS1 has had glasses for a year now. Previous to this his eye tests were fine. When he went back six months after he first had glasses they said his eyes had got a fair bit worse. They also said that usually eyes don't tend to go short sighted til teenage years (I know I was 11 when mine did).
I think basically they were trying to tell me they were going to get a lot worse.
What are anyone elses experiences with early onset shortsightedness?