儿童圆锥角膜与高度近视性散光的角膜地形图比较

Comparison of corneal topography between keratoconus and astigmatism with high myopia in children

目的:评价计算机辅助的角膜地形图分析系统在儿童圆锥角膜与儿童高度近视性散光的鉴别诊断中的作用。方法:用TMS-4角膜地形图仪测量圆锥角膜组20例及高度近视性散光组20例的角膜参数并进行分析。结果:圆锥角膜组的角膜中央的屈光力、角膜平均表面对称指数、表面不规则指数、同一患者两眼角膜中央屈光力的差值、I-S值等均明显高于高度近视性散光眼组的各对应值(P<0.01),模拟散光度数与高散光组也有明显差异(P<0.05),特别是同一患者两眼角膜中央屈光力的差值、I-S值对于两者的鉴别最为敏感。结论:用角膜地形图对儿童圆锥角膜及儿童高度近视性散光的角膜参数进行分析,有助于圆锥角膜的鉴别诊断,避免误诊为弱视并进行不必要的弱视训练。

AIM： To evaluate the role of corneal topography in distinguishing children keratoconus from high myopic astigmatism. METHODS： This study analyzed the corneal index of twenty patients diagnosed with kerotoconus and twenty patiens diagnosed with high myopic astigmatism using TMS-4 corneal topography. RESULTS： Keratoconus group was compared with high myopic astigmatism group, the former was significantly higher than the latter in central corneal refractive power, surface asymmetry index, surface irregularity index, difference in central corneal refractive power of two eyes in same patient , and I-S （ P 〈 0. 01 ）. And statistically significiant difference was found in SimK＇s Astig （P 〈 0.05）, espically differences in central corneal refractive power of two eyes and I-S were sensitive to identify. CONCLUSION： It is useful for identifying children kerotoconus and high myopic astigmatism using corneal topography to analyse index, thus we can avoid misdiagnosis of amblyopia and unnecessary training.