Long time wearing prescription glasses for one who have perfect vision would finally make vision become worse and need glasses forever. For people wearing non-prescription glasses, please make sure there is no prescription on your lenses. If you get a headache, sore eyes, and/or blurry vision while you are wearing them, take them to be checked at the optical stores.
If he sometimes wears prescription glasses, his vision won't get worse. However, he may get headache and blurry vision if he wear prescription glasses with good vision. If he wears prescription glasses all the time, then his vision will become worse later.
I once wore my friend's prescription glasses (he is -5.00 in both eyes) and I feel a big dizziness and can't see things clear.I think if you wear the prescription glasses which you don't need for a long time,your vision would surely get worse and finally end up with wearing glasses.