Pre-Surgery Requirements
Patients wearing soft contact lenses typically are instructed to stop wearing them approximately 7 to 10 days before surgery. Some surgeons recommend that patients wearing hard contact lenses should stop wearing them for a minimum of six weeks plus another six weeks for every three years the hard contacts had been worn.
Before the surgery, the surfaces of the patient’s corneas are examined with a computer-controlled scanning device to determine their exact shape. Using low-power lasers, it creates a topographic map of the cornea. This process also detects astigmatism and other irregularities in the shape of the cornea.
Using this information, the surgeon calculates the amount and locations of corneal tissue to be removed during the operation. The patient typically is prescribed an antibiotic to start taking beforehand, to minimize the risk of infection after the procedure.
Higher order Aberrations are visual problems not captured in a traditional eye exam. In a young healthy eye, the level of higher order aberrations are typically low and insignificant.
Concern has long plagued the tendency of refractive surgeries...
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