I also work in Pizza Hut, and my glasses are totally fine.
Generally, it takes at least one year to be a trainee in mt.
I'm afraid you won't last that long.
I feel very tired. Stand for 4-8 hours every day. This is the normal time. Our shop is short of people now, and my paralyzed father stands for more than ten hours a day. There is an hour's paid rest in the middle. )