双眼对照的“五分法”是判断圆锥角膜的常用方法之一
对于早期或可疑圆锥角膜,仅凭屈光四图无法做出准确判断,根据圆锥角膜双眼不对称改变的特征,结合双眼对照评估高度及厚度数据的对称性非常重要!

读图时先判断形态对称性,再看数值,可使用“五分法”评估患者圆锥角膜风险,根据已发表的研究结果,具体参考如下1
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评分标准 |
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如双眼间差异 则阳性(+1分) |
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前表面平均曲率Km |
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≥0.3D |
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后表面平均曲率Km |
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≥0.1D |
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最薄点角膜厚度 |
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≥12μm |
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最薄点位置前表面高度 |
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≥2μm |
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最薄点位置后表面高度 |
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≥5μm |
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3分:可见于6%~11%健康眼
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4分:可见于少于4%健康眼
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5分:可见于少于1%健康眼
参考文献
1 Galletti JD, et al. Corneal Asymmetry Analysis by Pentacam Scheimpflug Tomography for Keratoconus Diagnosis. J Refract Surg. 2015.
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