准分子激光屈光性角膜切削术后屈光回退的多因素分析

目的：探讨准分子激光屈光性角膜切削术后屈光回退的主要因素。方法：采用VISX20／20型准分子激光仪对121例214眼近视患者行准分子激光角膜切削术，术后随访2年。分二组进行比较，Ⅰ组为低中度近视（－1．00D－－6．00D）124眼，Ⅱ组为高度近视（－6．25D－－16．00D）90眼。结果：术后2年低中度近视回退率9．7％，高度近视回退率27．8％（P＜0．005），高度近视中高龄组较低龄组回退率高（P＜0．005），较严重的角膜上皮下雾状混浊与回退伴行。结论：准分子激光角膜切削术后屈光回退的主要因素有预期矫正屈光度，角膜Haze及年龄。

Mutiple Factors Analysis of Myopic Regression after Photorefractive Keratectomy

PURPOSE: To investigate myopic regression after excimer laser photorefractive keratectomy(PRK) in patients with myopia. METHODS: PRK was performed to correct myopia errors from 1.00 D to 16.00 D diopters on 214 myopia eyes(121 patients). All eyes were divided into two groups: group I--1.00 D(-)-6.00 D (124 eyes), group II--6.25 D(-)-16.00 D(90 eyes). All the patients were followed up for two years. RESULTS: A Significant positive correlation was found between the regression and the extents of attempted correction. The rate of regression in mild to moderate myopia group was 9.7% while in highter group it was 27.8% (P < 0.005). The rate of regression of older age group in lighter myopia group was highter than that in younger case (P < 0.005). Relatively severe haze under the corneal epithelium often accompanies the regression. CONCLUSION: The main factors which caused the myopia regression after PRK was the extent of attempted correction, patients' age and corneal haze.