Light passes through your cornea and through the lens in your eye. Any abnormalities in your cornea or lens can cause your vision to be distorted. This distortions typically result in nearsightedness or farsightedness. An astigmatism is a cornea that is out of round and distorts vision. This is also commonly corrected with Lasik eye surgery.
LASIK eye surgery involves two primary steps. First, the femtosecond laser is used to create a flap that is about 2 human hairs think.
The Eximer laser is used in the second step where the corneal tissue is precisely vaporized in matter of seconds to reshape the cornea. The reshaping ensures light passing through your eye creates a clearer image to the retina thus improving sight. The best technology and surgeons complete this process in matter of minutes.
It is commonplace for people having LASIK eye surgery to literally get up from the procedure and be able to see more clearly. It is one of the safest and most common medical procedures.