When someone is Nearsighted, light comes into focus in front of the retina. If the eye is Farsighted, light comes into focus behind the retina, With Astigmatism, light comes into focus at different places. Lasik reshapes the cornea to correct these problems. In Lasik, the surgeon first uses a Femtosecond Laser to make a flap on the cornea in about 10 seconds. Then the surgeon bluntly elevates this flap. The Excimer Laser is next used to reshape the cornea in about a minute. The flap is then replaced and dried into place. Vision without glasses is usually excellent in several hours.
Patients who require progressive glasses or reading glasses to read may have one eye corrected for distance vision and the other eye corrected for near vision and see well near and far without glasses with Lasik.