LASIK surgery improves the uncorrected vision—one's visual capacity while not wearing corrective lenses—in most patients who have the procedure. At LASIK MD, over 96% of patients with low to moderate myopia achieve 20/20 vision or better after the initial laser procedure, which is the visual acuity similar to that with contact lenses. This number increases to over 99% when an enhancement procedure is included, if needed.
However, there are no guarantees that you will have perfect vision. Patients with high myopia (more than -8D) and high hyperopia (more than +4D) should have realistic expectations. People who are most satisfied with the results of laser correction clearly understand the potential risks and complications and possess realistic expectations as to what their vision will be like after surgery.