>>259840depends. If your vision is still degrading it can continue to degrade after the procedure. this is why part of being a good candidate is having stable vision. I, for example got glasses in 5th grade and had not had a prescription change since i was 14 or 15 (i was 26 when i got it).
some doctors will not do it unless you have years or prescription stability.
another factor is age related eye changes like Presbyopia. alot of people start getting at around or after age 40 and it usually can not be corrected by refractive surgery because the mechanism by which vision is degraded different. So alot of times its not that the surgery wears off, its just that people get it in their mid 30s, then 5 years later they are becoming near sighted due to a different type of vision loss. this is another thing that a good doctor will go over ad nauseam before choosing refractive surgery.