Bogan S J, Waring G O, Ibrahim O, Drews C, Curtis L
Department of Ophthalmology, Emory University School of Medicine, Atlanta, Ga. 30322.
Arch Ophthalmol. 1990 Jul;108(7):945-9. doi: 10.1001/archopht.1990.01070090047037.
We evaluated the topography of 399 normal corneas in 212 subjects with computer-assisted videokeratography. The mean subject age was 37 years (range, 8 to 79 years). Mean spherical equivalent refraction was -1.00 diopters (range, +5.50 to -8.37 diopters). A qualitative classification system for corneal topography was derived based on patterns seen on color-coded topographic maps. Corneas were classified into groups by three independent masked ophthalmologists based on this system. Patterns included round (22.6%), oval (20.8%), symmetric bow tie (17.5%), asymmetric bow tie (32.1%), and irregular (7.1%). All corneas were steeper centrally and flatter peripherally. There was a statistically significant difference among patterns for keratometric astigmatism, but not for spherical equivalent refraction, mean keratometric power, or age of subject. Classification of normal corneal topography is an important step in the process of characterizing the shape of normal and pathologic corneas.
我们使用计算机辅助角膜地形图仪对212名受试者的399只正常角膜的地形进行了评估。受试者的平均年龄为37岁（范围为8至79岁）。平均等效球镜度为-1.00屈光度（范围为+5.50至-8.37屈光度）。基于彩色编码地形图上看到的模式，得出了一种角膜地形图的定性分类系统。三位独立的盲法眼科医生根据该系统将角膜分为不同组。模式包括圆形（22.6%）、椭圆形（20.8%）、对称领结形（17.5%）、不对称领结形（32.1%）和不规则形（7.1%）。所有角膜中央更陡峭，周边更平坦。角膜散光在不同模式之间存在统计学显著差异，但等效球镜度、平均角膜曲率计屈光度或受试者年龄之间不存在差异。正常角膜地形图的分类是表征正常和病理性角膜形状过程中的重要一步。
