IOL Calculations Following Photorefractive Keratectomy

ABSTRACT

Since excimet laser was introduced to refractive surgery more than 10 years ago, charact may have developed in some patients following photorefractive keratectomy (PRK). In those cases, there is a difficulty in calculating IOL power because of the mismeasurement of the corneal power(K) using manual keratometer, automated keratometer or corneal topography. Therefore, in case of a patient having cataract after PRK using the rigid contact lens and the calculated keratometry method. And then, we chose the flattest K measurement between the above methods, manual keratometer, automated keratometer and corneal topography. The desired spherical equivalent of the right eye after cataract surgery was decided to be -1.00D to reduce anisometropia, and that of the left eye, which had been operated on five months later, was emmetropic. the result was that the spherical equivalents after the operation were -0.88D for the right eye and -0.25D for the left eye, and the corrected visual acuity was 0.8 for the right and 0.9 for the left. It is considered that choosing the flattest K using the rigid contact lens method, the calculated keratometry method, manual keratometer, automated keratometer and corneal topography could be the best way to avoid postoperative hyperopia in calculating IOL power after PRK.