What is Lasik?
Laser assisted in situ keratomilleusis (LASIK) is a type of refractive surgery that permanently changes the shape of the cornea to correct.
Types of Refractive Error
Myopia is when your eye is longer than usual or the cornea and lens have too much focusing power, light rays focus in front of the retina instead of on it. Myopia or nearsightedness means you have a hard time seeing objects at a distance.
Hyperopia is when your eye is shorter than usual, or the cornea and lens lack the necessary focusing power, light rays focus beyond the retina. Hyperopia or farsightedness means you cant see close objects clearly. A young person may be mildly farsighted but unaware of it because the lens is flexible and compensates for the error by bringing the light rays forward and onto the retina.
Astigmatism occurs when the curve of the cornea is uneven – steeper in one direction than the other - like the shape of an egg or the back of a spoon. This uneven curve causes light rays to focus on many points on the retina, distorting both near and far vision.