Most patients experience a large improvement in their vision the first day after LASIK, usually 20/40 or better. Results depend to a large extent on the patient's preoperative prescription. In general, patients can expect to regain approximately 90 to 95 percent of their vision in the first two to three days after LASIK. The remainder of their vision will improve gradually over several weeks. Patients with significant astigmatism or who are very nearsighted or farsighted may experience slower sight recovery and stabilization.