Astigmatic keratotomy is similar to RK, and is performed to correct astigmatism along with nearsightedness, or when there is only astigmatism. Two incisions are made at the time of RK to flatten the astigmatic part of the cornea.
Although RK has been refined over the years, the results are not perfect in every patient. The ability of surgeons to alter the shape of the cornea is not yet as precise as the ability of lens makers to make a pair of glasses or contact lenses that perfectly match the requirements of the wearer.
In addition, the cornea heals slowly after RK, usually becoming flatter as it does so. Thus, some surgeons attempt to compensate for this by undercorrecting the cornea during the operation. Then, as the cornea flattens further during healing, the patient's eyes may approach emmetropia, or perfect vision.
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