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角膜是眼屈光系统中最重要的光学折射面,本文选择3种方法对角膜散光进行测量。随机选择屈光不正患者360只眼,对计算机辅助的角膜地形图检查、角膜曲率计及散瞳验光3种测量角膜表面的方法进行比较。发现3组测量方法在散光轴位方面无显著性差异。提出角膜地形图中△K_(sim)即表示角膜规则性散光。散光度数在角膜地形图和角膜曲率计组间无显著性差异,而散瞳验光组与另两组间均存在显著性差异。提示在测量角膜散光方面角膜曲率计与角膜地形图具有相似的临床价值,但由于角膜曲率计测量范围小、取点少,因此在反映角膜表面细微变化方面受到很大限制。本文还对角膜地形图图形与参数△K_(sim)间关系进行了探讨。
The cornea is the most important optical refractive surface of the eye refractive system, this article chose three methods to measure corneal astigmatism. A total of 360 eyes were randomly selected and compared with computer-assisted corneal topography, corneal curvature and mydriatic optometry to measure the corneal surface. Three sets of measurements were found no significant differences in axial astigmatism. Proposed corneal topography △ K_ (sim) that corneal regular astigmatism. There was no significant difference in astigmatism between corneal topography and keratometer group, while there was significant difference between mydriatic optometry group and the other two groups. It is suggested that keratometer has similar clinical value to corneal topography in the measurement of corneal astigmatism. However, due to the small measuring range and fewer points of corneal curvature measurement, it is very limited in reflecting the subtle changes of corneal surface. The paper also discussed the relation between the graph of corneal topography and parameter △ K_ (sim).