My son has 200 度散光 when he was in K2, at that time, he has 50 度遠視 too. The doctor said it was 遺傳 from parents.
When he was in P1, his 散光 went to 400度, which is very serious, so we were very worried! And at that time, his 遠視 disappeared and changed to 50 度近視!!
And now, he is 8 years old and his 散光 is around 350度 and 近視 is 200 度. He does not watch TV much (around 1 to 2 hours each day) and only plays computer games on weekend for less than an hour. But he likes reading books, is it the reason why he got such high degree of 散光 and rapid increase of 近視?!
He has to take the eye check up every half year because we are afraid he will be blind!
I have consulted the optical doctor about the 視力 "喬" 正, but he said there is no scientific statistics showing the effects of it..