Various tests are required to obtain information that might alter the procedure for each operation. This includes information about how much myopia or astigmatism is present, the degree of corneal curvature, and the thickness of the cornea. A thorough examination of your eyes is also done to determine if there are any medical problems that might interfere with surgery. During The patient is given a mild sedative prior to surgery and the eye is prepped normally. During the operation, the front surface of the eye is numbed with drops.
Some surgeons advocate retro-bulbar anesthesia.
However, its use is not necessarily warranted and some of these cases have developed acute optic atrophy, resulting in total vision loss. This allows light to focus on the retinal screen, once again permitting clear vision. The operation is generally bloodless and painless. Precise microscopic control must be maintained over the length, depth, and arrangement of these micro-incisions in order to achieve proper optical correction. The knife blade used is generally a crystalline blade like sapphire, providing for the best results and more uniform cuts.