目的:观察2mm小光斑飞点扫描伴主动眼球跟踪系统的激光机行常规LASIK术后,眼高阶像差和角膜非球面系数Q值的改变,同时观察术后不同瞳孔直径下眼高阶像差的变化。方法:近视患者33例60眼均接受常规LASIK手术,术前和术后3mo分别检查记录5mm和6mm瞳孔直径下总高阶像差、三阶彗差、四阶球差和角膜前表面非球面系数Q值,并进行统计学分析。结果:LASIK术后,5mm和6mm瞳孔直径下各高阶像差均较术前显著增加,其中四阶球差增加最为显著;术后水平彗差比垂直彗差增加显著;术前术后6mm直径下高阶像差均较5mm直径下显著增大;LASIK术后角膜非球面系数Q值向正值方向明显变化,差异具有显著性。结论:近视眼常规LASIK术后,各项高阶像差明显增大,其中球差增大最为显著。手术前后6mm瞳孔直径下高阶像差均比5mm瞳孔直径下高阶像差明显增大。术后角膜表面非球面系数Q值由负值变为正值,且增大显著。

AIM:To observe the changes of ocular higher-order aberrations and corneal aspherical coefficient Q value and high aberration under different pupil diameter after conventional LASIK surgery using laser machine with small scanning spot 2mm active eye tracking system.METHODS: Thirty-three patients 60 eyes with myopia were received conventional LASIK surgery. The preoperative and postoperative 3 months records of total order aberrations, third order cornea, the fourth-order spherical aberration and corneal aspheric surface coefficient Q value in pupil diameter of 5mm and 6mm were examined and statistically analyzed. RESULTS: After LASIK surgery, 5mm and 6mm pupil diameters,higher order aberrations were increased significantly, especially in the fourth-order spherical aberration. There was significant increase in horizon coma than the vertical coma. Compared with under 5mm diameter higher order aberrations, those under 6mm were significantly increased before and after surgery. Corneal aspheric coefficient Q value significantly changed to the positive direction and there was significant difference after LASIK sugery.CONCLUSION: After conventional LASIK surgery with myopia, higher-order aberrations are increased significantly, especially in the fourth-order spherical aberration. After surgery, there is significant increase in the higher-order aberrations under 6mm pupil diameter than under 5mm pupil diameter. Corneal surface aspherical coefficient Q value is changed from negative to positive and there is significantly statistical difference.

R779.63