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国人儿童正视眼角膜非球面光学特性研究

Evaluation the Corneal Aspherity in Chinese Emetropia Children
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摘要 目的应用角膜地形图仪研究正常发育儿童角膜的光学形态学特征。方法正视眼少儿49例(78眼)。睫状肌麻痹下带状光检影镜结合电脑验光仪确定屈光度;Humphrey 角膜地形图仪测量角膜前表面不同区域两个正交子午线曲率值,角膜不规则值(corneal irregular measure,CIM)与形状系数(shape factor,SF)。结果正常发育儿童角膜形状系数(SF)=0.281±0.105;角膜不规则值(CIM)=0.64±0.16,角膜不同位置的平均曲率值从顶点到直径7mm 平均角膜曲率值逐渐变小,顶点与直径3mm 处的角膜曲率值之间无差异、直径3mm、直径5mm、直径7mm 角膜曲率值之间两两有差异。角膜形状系数(SF)与角膜直径5mm、7mm 处平均角膜曲率值有一定相关关系)(r^2=0.264,P=0.000)。结论儿童正视眼角膜前表面具有中央区曲率相对稳定,从中央到周边逐渐变平坦的扁长椭圆,而且存在一定的微小隆。(中国眼耳鼻喉科杂志,2005,5:369~370) Purpose The current study was conducted to determine the corneal aspherity of emetmpia children.Methods Using computerized videokeratography (Humphrey ALTAS Corneal Topography System) , the topographic parameters in 78 eyes of 49 emetropia, which included the shape factor (DF), corneal irregular measure (CIM) , the average power of zone of apex, 3 mm, 5 mm, 7 mm in diameter and the simulated keratoscopic reading (SimK).Refraction was measured with retinoscopy and autorefractor with cycloplegia.Results The corneal shape factor (SF) is 0.281 ± 0. 105 with normal distribution , the corneal irregular measure (CIM) is 0.64 ± 0.16 with normal distribution. The average power of zone apex,3 mm,5 mm,7 mm in diameter ,the simulated keratoscopic reacting (SimK) is 43.91 ± 1.44,43.86 ± 1.42,43.62 ± 1.45,43.15 ± 1.40,43.61 ± 1.43 diopter(D) respectively. A statistically significant positive correlation is also found between corneal shape factor (SF) and the average power of zone 5 mm,7 mm in diameter (r^2 = 0.264 P = 0.000).Conclusion The children's corneal surface from center to periphery shows an prolate ellipse to correct spherical aberration. A tendency for cornea to flatten is rapid from center to periphery.
出处 《中国眼耳鼻喉科杂志》 2005年第6期369-370,378,共3页 Chinese Journal of Ophthalmology and Otorhinolaryngology
关键词 儿童 正视眼 角膜地形图 角膜形状 children emetropia corneal topography corneal shape
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