翼状胬肉切除术后角膜地形图及散光度的改变

目的探讨翼状胬肉切除术后角膜地形图及散光度的改变。方法对56例（56眼）翼状胬肉行手术切除,分别于术前、术后使用角膜地形图仪进行检测,记录术前、术后第3个月的角膜地形图主要参数、最佳矫正视力,术前和术后以角膜地形图及综合验光仪验光法确定角膜散光情况,并进行统计学分析。结果角膜地形图检查平均散光：术前为（5.14±3.12）D,术后为（3.19±2.44）D,术后散光较术前减少,差异具有非常显著的统计学意义（P〈0.01）。综合验光仪验光平均散光：术前（1.91±0.64）D,术后（1.12±0.71）D,术后较术前亦有所减少,差异具有统计学意义（P〈0.05）。角膜地形图参数：平均中央角膜曲率术前（42.94±3.13）D,术后（44.72±2.94）D;平均角膜几何中心与视轴中心距离术前（1.17±1.26）mm,术后（0.64±0.41）mm;平均角膜表面形态系数SF术前0.53±0.17,术后0.31±0.14;平均角膜表面不规则指数CIM术前3.29±1.35,术后2.01±1.04;上述参数术前与术后比较,差异均有统计学意义（P〈0.05）。平均最佳矫正视力 ：术前4.73±0.31,术后4.92±0.29,两者差异有统计学意义（P〈0.05）。结论翼状胬肉切除术能明显减少角膜散光,改善术前角膜地形图的不规则形态,有利于提高视力和视觉质量。

Corneal topographic changes after excision of pterygia

Objective To evaluate corneal topographic changes after excision of pterygia.Methods Using the corneal topography analysis system,changes in topographic parameters and best corrected visual acuity were analyzed before surgery and 3 months after the surgical removal of pterygia in 56 eyes.Results Topographic astigmatism was（5.14 ±3.12）D before surgery and（3.19 ± 2.44）D after surgery（P 〈0.001）.Clinical astigmatism was（1.91 ± 0.64）D before surgery and（1.12 ±0.71）D after surgery（P 〈0.05）.Corneal curvature at the central optic zone was（42.94±3.13）D before surgery and（44.72±2.94）D after surgery（P〈0.05）.The distance between the apex of the cornea and the optic center was（1.17 ± 1.26）mm before surgery and（0.64±0.41）mm after surgery（P〈0.05）.The shape factor（SF） was 0.53±0.17 before surgery and 0.31±0.14 after surgery（P〈0.05）.The corneal irregularity measurement（CIM） was 3.29±1.35 before surgery and 2.01±1.04 after surgery（P〈0.05）.Best corrected visual acuity was 4.73±0.31 before surgery and 4.92± 0.29 after surgery（P〈0.05）.Conclusion Surgical excision can significantly improve induced abnormal corneal topographic changes and reduce corneal astigmatism from pterygia.