How would prepare for prk?

See ophthalmologist. You lasik/prk surgeon will do all the work for you in your pre-treatment examinations and answer all questions you might have. On the day of surgery, eat lightly and try not to worry. If you are a terribly nervous sort, you might need to have a valium prescribed which your lasik surgeon can prescribe.
Prepare Yourself. The day of your procedure make sure you are relaxed and that someone drives to and from the surgery center. Have a very light meal. If a woman: no make up or anything scented if a man: any lotion or aftershave that is scented.