Over 12.00 diopters we usually do one eye at a time. You will have less dependence on glasses, but you may require glasses after surgery. However, you may wish to have glasses for night driving and you may need glasses for reading if you are over 40 years old. Vision can be blurry immediately after surgery. It is usually worse with PRK which takes longer to heal the surface of the eye.
Vision can be blurry for several weeks or months until it stabilizes.
How ever, the healing process varies for each patient, and it is not possible to precisely predict when you will achieve your best vision. If there is haze, it can take months before the vision clears and stabilizes. Because laser surgery is a relatively new procedure, the long term effects have not been fully determined. We have data for the 3 year period after surgery and the results appear to be stable. With RK surgery, some of the higher myopes can have a hyperopic shift of 0.25 diopter per decade.