Excimer laser photorefractive keratectomy for myopia: Two years of follow-up

Aim: To study the safety and efficacy of laser photorefractive keratectomy in different myopia groups. Materials and methods: 51 eyes of 30 patients underwent photorefractive keratectomy (PRK) with a 193nm excimer laser to correct myopia. The eyes were divided into three groups: low, moderate, and high myopia. Results: Two years after PRK, 100% of the eyes in the low myopia group, 86.7% in the moderate myopia group, and 28.6% in the high myopia group achieved an uncorrected visual acuity of 20/40 or better. In the low myopia group, 100% were within ±1 diopter (D) of emmetropia, as were 86.7% in the moderate group and 23.8% in the high myopia group. None of the eyes in the low myopia group, 13.3% in the moderate myopia group, and 57.1% in the high myopia group regressed more than 1D over the observation period. No significant complications were observed. Conclusion: Photorefractive keratectomy can be considered as an effective and safe procedure for correcting myopia in the low and moderate range.