Instead of waiting for six months, you can right now get his pupil dilated and get a refraction
done. If the child is not co-operating he can be prescribed glasses objectively on basis of reading of refraction.
He should use the glasses constantly and if child is not cooperating they should be used as much as possible. For the time being, you can give him some lubricating drop to have a soothing effect on this eyes. He should be given good nutrition and some analgesic
in case there is some pain (like headache) due to refractive error