Thank you for your reminding. Actually

Thank you for your reminding. Actually based on my understanding, he needs the eye glasses since the main purpose is to prevent he has lazy eye and cross eyes. He is young, and still in the development stage of his optical nerves. If we don't give him the glasses, he will just use one eye for a clear vision, thus put his other eye's optical nerves underdeveloped, then he will become lazy eye. Or he will try to cross his eyes to get a clear vision. That will be very bad

Anyway, thank you very much for your reminding!