Photorefractive keratectomy to treat myopia and astigmatism after radial keratotomy and penetrating keratoplasty

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Abstract
Fifteen eyes with an initial myopia between −5.00 diopters (D) and −12.00 D were treated with radial keratotomy (RK) followed by photorefractive keratectomy (PRK) at least 6 months later and observed for 6 months to 24 months. Five eyes that had penetrating keratoplasty (PKP) were treated for residual ametropia by PRK and followed for up to two years. For the RK-treated eyes, mean pre-PRK refraction was −4.00 D sphere and +1.25 D cylinder, which improved to −0.52 D sphere and +0.73 D cylinder. Incidence of complications, including corneal haze, was extremely low in both the RK and PKP groups. In summary, PRK is a valuable method for correcting ametropia following RK and PKP, with risks similar to that for eyes having PRK as the initial refractive procedure.