Meza J, Perez-Santonja J J, Moreno E, Zato M A
Department of Ophthalmology, Jiménez-Díaz Foundation, Autonomous University of Madrid School of Medicine, Spain.
J Cataract Refract Surg. 1994 Sep;20(5):485-9. doi: 10.1016/s0886-3350(13)80224-6.
We report the results of a prospective study that evaluated the efficacy, predictability, and safety of excimer laser photorefractive keratectomy (PRK) to correct residual myopia after radial keratotomy (RK). Using a 193 nm excimer laser, we performed PRK on ten undercorrected myopic eyes that had previous RK surgery. The mean interval between the RK and PRK was 1.5 years. Mean follow-up was seven months. Mean preoperative refraction was -4.08 +/- 1.35 diopters (D) and after PRK was +1.61 +/- 1.18 D at three months, +1.05 +/- 0.75 D at six months, and +0.79 +/- 0.83 D at 12 months. An uncorrected visual acuity of 20/40 or better was achieved in eight eyes at three months, seven eyes at six months, and three eyes at 12 months. One eye had a transient loss of two Snellen lines of best spectacle corrected visual acuity because of increased haze. No other significant complication was noted. Our study shows that PRK is a predictable, effective, stable, and safe technique to correct residual myopia after RK. The results were similar to those of PRK without prior surgery, although we noted a slightly greater hyperopic deviation. We believe that eyes undercorrected by RK may benefit from subsequent PRK.
我们报告了一项前瞻性研究的结果，该研究评估了准分子激光屈光性角膜切削术（PRK）矫正放射状角膜切开术（RK）后残余近视的疗效、可预测性和安全性。我们使用193nm准分子激光对10只先前接受过RK手术的近视欠矫眼进行了PRK。RK与PRK之间的平均间隔时间为1.5年。平均随访时间为7个月。术前平均屈光度为-4.08±1.35屈光度（D），PRK术后3个月为+1.61±1.18D，6个月为+1.05±0.75D，12个月为+0.79±0.83D。3个月时8只眼、6个月时7只眼、12个月时3只眼的裸眼视力达到20/40或更好。一只眼因雾状混浊加重而出现最佳矫正视力暂时下降两行。未发现其他严重并发症。我们的研究表明，PRK是一种矫正RK后残余近视的可预测、有效、稳定且安全的技术。结果与未接受过先前手术的PRK相似，尽管我们注意到有稍大的远视偏差。我们认为，RK欠矫的眼睛可能会从后续的PRK中获益。
