【摘要】 目的 评价白内障手术不同切口造成角膜屈光的动态变化。方法 随机选取白内障囊外摘出术（ECCE）组26例30眼,白内障超声乳化术（Phaco）组21例27眼,应用ORBSCAN裂隙光扫描角膜层面照相/测厚系统,于术前和术后 3天;1、2周;1、2、3个月对术眼角膜进行检测,比较分析术后角膜屈光的变化情况。结果 ECCE组、Phaco组术后角膜总平均屈光力变化不明显（P>0.05）,3天～1周主要受角膜厚度影响（P<0.05）;两组术后1个月角膜总合散光分别为3.95D±2.97D和1.89D±0.30D,差异有显著性（P<0.05）;两组角膜散光与手术时间呈二次抛物线回归关系,ECCE组在术后1个月出现散光骤变（P<0.05）,但两组角膜散光均于术后3个月趋向稳定（P>0.05）。结论白内障手术后角膜屈光存在动态变化。ORBSCAN通过检测角膜前后表面曲率。角膜厚度,比较真实地反映角膜形态学的改变。更多还原

【Abstract】 Objective To evaluate the changes of the corneal refractive power induced by different incision after cataract extraction. Methods The Orbscan slit scan corneal tomography/pachymetry system was used to investigate corneal refractive power on 26 cases ( 30 eyes) in group ECCE and 21 cases (27 eyes) in Phaco. The changes of the corneal refractive power before and after operation were compared. Results The changes of the corneal mean power after operation were no significant difference( P > 0. 05 ). There was a main influence on the corneal thickness in three days and one week later( P < 0. 05 ). At one month afler operation, the total astigmatism induced by operation was 3. 95 D ± 2. 97 D and 1. 89 D ± 0. 30 D in group ECCE and Phaco, respectively , the difference being statistically significant ( P < 0. 05 ) . Parabola regression relationship was shown between the corneal astigmatisms and operative time. There was a sudden change of the astigmatism in the group ECCE on 30 days after operation. But both astigmatisms tended to steady in 3 months ( P > 0. 05 ). Conclusion Refractive power of corneal after cataract extraction exists dynamic changes. Orbscan can truely reveal the corneal shape which include anterior and posterior surface and thickness.更多还原