There is a downside to PRK. With Lasik, your new vision would come in almost instantly. With PRK it takes a little while, about a couple of weeks. There is one other small drawback, be prepared for pain. I had a lot of pain with my procedure for the first 48 hours. I had a bit of difficulty. One of the protective contact lenses that they placed in my eye came out. This caused me a great deal of discomfort.
Don't let anyone tell you that PRK doesn't hurt. For those first 48 hours, it is going to hurt.
I honestly don't remember much pain. But I do want to tell you that one of the side effects is poor night vision. Lights are more blurred, etc. I always wear anti glare glasses when I drive...and it make me less likely to drive at night. That was definitely a downside.