[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.