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目的 了解圆锥角膜的角膜地形图改变。方法 应用Orbscan角膜地形图系统检测 35例 (47只眼 )圆锥角膜患者的角膜 ,对其角膜中心点、锥顶、角膜后表面最高点、角膜屈光度最大点和角膜最薄点的位置、角膜前表面高度、角膜屈光度及角膜厚度 ,以及角膜屈光度和角膜前表面高度的关系进行分析。结果 圆锥角膜锥顶的高度平均为 (0 10 2± 0 0 4 4 )mm ,距角膜中心点的距离为(0 6 86± 0 376 )mm。圆锥角膜锥顶、角膜后表面最高点和角膜屈光度最大点的位置分布以颞下最多 ,其他依次为鼻下、颞上、鼻上 ,最薄点以鼻下方为多 ,其次为颞下。圆锥角膜的角膜曲率为 (6 0 9± 10 4 / 5 3 4± 8 7)D ,角膜中央直径 3mm、5mm内平均屈光度数分别为 (5 7 1± 8 0 )D、(5 0 7± 5 4 )D。圆锥角膜锥顶的高度与此点的屈光度数呈明显的正相关 (r=0 6 97,P <0 0 1) ,与此点的角膜厚度呈负相关 (r=- 0 5 6 3,P <0 0 1)。结论 Orbscan角膜地形图系统可为早期诊断圆锥角膜并提供形态学依据。
Objective To understand the change of corneal topography of keratoconus. Methods The cornea of 35 patients (47 eyes) with keratoconus was examined by Orbscan corneal topography. The corneal center, the top of the cornea, the highest point of corneal posterior surface, the maximum point of corneal refraction and the thinnest point of cornea were observed. Surface height, corneal refractive power and corneal thickness, as well as corneal refractive power and corneal surface height of the relationship between the analysis. Results The average height of the cone of the keratoconus was (0 10 2 ± 0 0 4 4) mm, and the distance from the center of the cornea was (0 6 86 ± 0 376) mm. Conus corneal top, the highest point of the corneal surface and the corneal maximum point of corneal refractive distribution of the most infratemporal and other followed by the nasal, temporal, nasal, the thinnest point to the nose below the bottom, followed by the infratemporal. The corneal curvature of the keratoconus was (6 0 9 ± 10 4/5 34 ± 8 7) D, the central diameter of the cornea was 3 mm, and the average diopters of 5 mm were (5 7 1 ± 8 0) D and 5 0 7 ± 5 4) D. There was a significant positive correlation between the height of the pyramidal cone and the refractive power at this point (r = 0 6 97, P 0 01), which was negatively correlated with corneal thickness at this point (r = - 0 5 6 3, P <0 0 1). Conclusion Orbscan corneal topography system can provide early diagnosis of keratoconus and provide morphological evidence.