[Clinical analysis of photorefractive keratectomy for correction of myopic astigmatism].

OBJECTIVE: To evaluate the efficacy and accuracy of photorefractive keratectomy (PRK) for correction of myopic astigmatism. METHODS: Keracor 116 excimer laser was used. According to the preoperative astigmatism, 387 eyes were divided into group A (no astigmatism), B[astigmatism lower than 2 diopters(D)] and C (astigmatism greater than 2 D), and treated with PRK. Vectorial analysis was used to calculate the surgical effects. RESULTS: The mean preoperative astigmatism was 1.29 +/- 0.48 D and 3.07 +/- 0.72 D, the surgical correction was 1.10 +/- 0.67 D and 2.42 +/- 0.93 D, and the angle between pre- and post-operative astigmatic axes was 5.8 degrees +/- 2.1 degrees and 4.9 degrees +/- 2.4 degrees in group B and C, respectively. CONCLUSION: The correction of astigmatism with PRK is accurate, but some regression has been observed, especially in those with high preoperative astigmatism.