Abstract
The aim of this study was to evaluate the safety, effectiveness, and predictability of photorefractive keratectomy (PRK) for severe myopia and astigmatism following penetrating keratoplasty. PRK was performed on 42 eyes, and 33 eyes were followed up for at least 6 months. Mean preoperative spherical equivalent was -8.29 +/- 4.01 diopters (D), which decreased to -2.96 +/- 3.26 D in manifest refraction at 6 months. Keratometric power reduced from 48.06 +/- 3.32 D preoperatively to 43.97 +/- 3.40 D. Refractive and keratometric astigmatism attained the reduction of 31.0% and 13.56% in average respectively. Twenty three eyes had improved uncorrected visual acuity. PRK was effective in reducing post-keratoplasty myopia and astigmatism, but the predictability was not as good as in the non-grafted eye.
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