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Most refractive surgeons now believe that -10D is the upper limit for good patient satisfaction, although LASIK can be used effectively under certain circumstances for prescriptions as high as -12D. Above these levels, other procedures involving the implanting of lenses inside the eye will probably become the procedures of choice. PRK is approved by the FDA for treatments of up to -12D. However, most surgeons prefer LASIK to PRK when treating more than 4D of myopia. Corneal thickness measurements are very important and this also limits the amount of correction that is performed.
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