Ghosting 2.5 years after PRK. Any suggestions?

I had PRK done in both eyes 2.5 years ago. My vision has been 20/20 since 6 months after my initial surgery according to my follow up exams. However, I have had ghosting ever since the surgery. It is especially bad at night. I had a touch up surgery in one eye 6 months ago. I still have the double vision, just in a different pattern. I was told that I have "higher order aberrations." Is there any way to fix the ghosting? I get splitting headaches, especially when I read.

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