近视眼393例角膜偏心率与相关参数

Relationship between corneal eccentricity and other corneal parameters in 393 cases of myopia

目的 :研究近视眼患者的角膜偏心率 (e值 )及其与屈光度、角膜曲率、角膜散光之间的相互关联 .方法 :采用计算机辅助角膜地形图测量 ,对门诊屈光不正患者 393例 (76 2只眼 )的e值、屈光度、角膜曲率、角膜散光进行统计学分析 ;运用SPSS 10 .0统计软件作角膜偏心率的均数、标准差及其与各参数之间的相关分析 .结果 :本组患者的e值范围为 0～1.18(右 0～ 0 .73,左 0～ 1.18) ;e值为 0 .39± 0 .12 (右 0 .39±0 .11,左 0 .39± 0 .13) .e值与角膜散光呈负相关 (右眼Pear sonCorrelation =- 0 .10 5 ,P <0 .0 5 ;左眼PearsonCorrelation =- 0 .111,P <0 .0 5 ) .本组患者的e值与年龄、屈光度、角膜曲率均无显著关联 .结论 :角膜偏心率是屈光矫正的一项重要参数 ,推荐 0 .4作为年龄在

AIM: To investigate corneal eccentricity (e value)and its correlation with diopter, corneal curvature and corneal astigmatism. METHODS: Computerized corneal topography was performed on 393 outpatients (762 eyes) with refractive errors and the corneal eccentricity and its correlation with parameters,such as diopter, corneal curvature and corneal astigmatism,was statistically analyzed using SPSS 10.0 software. RESULTS: The e value of the series was calculated as 0.39 ±0.12 (R: 0.39 ±0.11, L: 0.39 ±0.13), with a range of 0 to 1.18 (R: 0-0.73, L: 0- 1.18). The e value was negative correlated with cylinder diopter (R: Pearson Correlation = -0.105, P <0.05 . L: Pearson Correlation = -0.111, P <0.05) and there was no significant correlation with age, sphere or corneal curvature. CONCLUSION: The corneal eccentricity is a key parameter for the correction of refractive errors. It is recommended that 0.4 be used as the e value for hard contact lenses in young patients aged under 35 years old.