Quite high to be honest. However, the results after laser eye surgery usually depend on your prescription which is taken before any treatment, at your consultation to determine if your suitable for laser eye surgery. Many clinics usually report results that show up to 95% of patients have 20/20 vision (or better) after laser eye surgery.
The chance of 20/20 vision is usually improved if you are short sighted rather than long sighted. Overall, in 2009 Ultralase reported that 93.4% of patients gained 20/20 vision whilst 99.9% of patients gained driving standard vision (6/12).
Optimax reported that 95.99% of their patients gained 20/20 vision, whilst 99.83% attained driving standard vision, these results are from January 2007 to December 2009 and are from 4,219 patients with a prescription of -0.5 to -3.0.
With over 90% of patients gaining 20/20 vision, you should book a consultation and get an expert surgeon to determine the chance of 20/20 vision for you or alternatively driving standard vision.