Purpose: To study results of retreatment after regression in myopic patients who underwent photorefractive keratectomy (PRK).
Methods: Procedures were performed with the Nidek EC-5000 excimer laser. This was a retrospective study of 20 of 2127 patients, with follow-up of at least 6 months, who underwent repeated excimer laser ablation.
Results: No patient with low myopia had regression. We evaluated six eyes (group I) with moderate myopia; 13 eyes (group II) with high myopia; and ten eyes (group III) with extreme myopia. Average uncorrected visual acuity at 6 months after retreatment was 0.73 +/- 0.21 in group I, 0.64 +/- 0.35 in group II, and 0.61 +/- 0.38 in group III. At six months after retreatment, the average was -0.36 +/- 1.05 D in group I, -0.42 +/- 1.12 D in group II, and -1.40 +/- 1.62 D in group III.
Conclusion: The amount and frequency of regression was higher in patients with high and extreme myopia; however, the preliminary results of retreatment of regression were satisfactory.