1111 Risk factor analysis for poor visual outcome following PRK

Purpose: To evaluate. long term efficacy, safety and stability of PRK for low and moderate myopia. Methods: 110 patients were treated for myopia up to 6D with the Summit Excimed excimer laser. The optical zone was 5mm in all cases. Manifest t&action. refraction under cycloplegla, comenl haze and comeal topography werc studied at D15, 1. 3, 6. 12. and 24 months after the surgery. Results: 110 patients completed all examinations up to 1 year. 58 patients were studied up to 2 years. The refractive results were. very good: C+/-O.4D at one year and -0.05+/0.4D at 2 years for manifest refraction, and 0.37+/-0.8 at one year and 0.25+/-0.7 at 2 years for refmction under cycloplegia. Comeal haze diminished with time up to 2 years (0.24+/-0.4 at one year and 0.12+/-0.3 at 2 years). Them were no statisticdly significant differences between one and 2 years results regarding refraction. uncorrected visual acuity and best corrected visual acuity among the 58 patients seen at 1 and 2 years afta the treatment, although some late regression was seen in very few eyes. Conclusion: The refractive results of PRX appear stable between 1 and 2 years after surgery for low myopia. Corneal clarity still improves with time between one and 2 years after the treatment. lll3 Vkion Res. Vol. 35. Suppl., pp. S5l -S245. 1995