To treat farsightedness , the central cornea must be made steeper. This is accomplished by directing the laser beam to affect a wider field which removes tissue from the corneal edge while leaving the center unaffected. To treat astigmatism , the cornea must be made more spherical. By changing the pattern of the beam, tissue is removed in one direction more than the other. At the same time, if the cornea is being treated for nearsightedness or farsightedness, the computer that guides the laser also corrects those conditions in addition to the astigmatism.
Most patients say they experience little or no discomfort during or after the procedure.
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