Retreatment of undercorrected photorefractive keratectomy for myopia.

Fourteen eyes treated by photorefractive keratectomy (PRK) for myopia required retreatment because of undercorrection. The mean preoperative refraction of these eyes had been -9.82 D (range 5.25 to 17.13). No eyes before photorefractive keratectomy had low myopia, three eyes had myopia between -3.10 and -6.00 D, four were between -6.10 and -10.00 D, and seven had more than -10.00 D of myopia. Retreatment was required for manifest scars in association with regression, unresponsive to topical corticosteroids. The retreatments were performed using a Summit ExciMed UV200LA excimer laser with a dual ablation technique utilizing a phototherapeutic keratectomy followed by a photorefractive keratectomy. Follow-up ranged from 1 to 9 months. Eight eyes followed more than 3 months had a mean spherical equivalent refraction of -0.58 D (range -7.35 to +1.25).