亚临床期与进展期圆锥角膜地形图的比较

目的探讨圆锥角膜患者角膜地形图的特点，以期早期发现圆锥角膜患者。方法5例（8只眼）亚临床期圆锥角膜患者，14例（20只眼）进展期圆锥角膜患者。检查项目：（1）角膜地形图形态，（2）角膜中央层屈光力，（3）角膜屈光度的变化范围，（4）角膜曲率，（5）角膜表面规则指数。结果亚临床期的患者中，角膜地形图主要表现为蝶形，且多为非对称性，进展期的患者主要表现为乳头形、卵圆形及球形，角膜中央屈光度，距角膜中央I—S值有差异。结论角膜地形图检查可以早期发现圆锥角膜。

Comparison of corneal topography between subclinical keratoconus and progressive keratoconus

Objective To investigate the characteritics of keratoconus under corneal topography,especially the early Keratoconus.Methods 19cases of Keratoconus were examined by corneal topography,in which 5 cases were in subclinical stage 14 cases(20 eyes)progressive.The topography morphology,central corneal refractive,power,keralometry,corneal astigmatism,the surface regularity index(SRI).Results The corneal topography of subclinical keratoconus showed bow-tie pattern,and most of them is asymmetric pattern.In progressive keratoconus,central area form a cone,the shape was round,oval and papilla-like central corneal refractive power,the I-S value were different.Conclusion Corneal topography may be a useful method to early diagnosis of keratoconus.