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目的探讨准分子激光屈光性角膜手术前后角膜地形图△ＳｉｍＫ变化值在散光度数变化判断中的作用。方法 对近视度为－１． ５０～－２４．００Ｄ，散光度数－０． ７５～－５．５０ Ｄ的患者 ８９例 １５０眼行准分子激光屈光性角膜切削术（ＰＲＫ）或准分子激光原位角膜磨削术（ＬＡＳＩＫ），观察６个月以上。经计算机得出角膜曲率△ＳｉｍＫ变化值 Ｘ与临床散光度数变化值Ｙ的散点图及相关系数ｒ值。结果手术前后Ｘ与Ｙ的关系：Ｙ＝１．４５３６Ｘ＋０．５７３４，ｒ＝０．７２１２，Ｐ＜０．００１。结论准分子激光手术前后角膜地形图△ＳｉｍＫ变化值与临床散光度数变化有高度相关性，对判断术后散光度数变化有重要的意义。
Objective To investigate the role of △ SimK changes in the determination of changes in astigmatism before and after laser refractive keratectomy. Method for myopia was -1. 50 ~ -24.00D, astigmatism degree -0. 89 patients (150 eyes) with 75 ~ -5.50 D underwent excimer laser photorefractive keratectomy (PRK) or excimer laser in situ keratomileusis (LASIK) for more than 6 months. The corneal curvature △ SimK change value X and clinical astigmatism degree change value Y of the scatter plot and the correlation coefficient r value. Results The relationship between X and Y before and after surgery: Y = 1.4536X + 0.5734, r = 0.7212, P <0.001. Conclusions The changes of △ SimK value before and after excimer laser surgery are highly correlated with the changes of clinical astigmatism degree, which is of great significance in judging the postoperative astigmatism degree changes.