I understand you can have one eye for far vision and one eye for close vision. I'm waiting for one of my eyes to get bad for the close vision PRK.
I don't know the success rate for PRK, but for RK, there were some problems. A niece had it done. Her vision was 20/20 for about a month, then she had to start wearing glasses again.
I will look at Google right now. They are sure to have something on it. Found it. Here it is.