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近视眼角膜前、后表面不同范围非球面性及其与角膜球差的关系

2013-7-18 09:52| 发布者: 海妮| 查看: 2640| 评论: 0 |来自: 中华眼视光学与视觉科学杂志

摘要:目的 探讨拟行准分子激光角膜屈光手术的近视患者角膜前、后表面不同范围非球面性(Q值)及其与角膜球差的关系.方法 横断面研究.选取拟行角膜屈光手术的近视及近视散光患者116例(116眼),年龄18~45岁,球镜度- 1.25~-10 ...
摘要: 目的 探讨拟行准分子激光角膜屈光手术的近视患者角膜前、后表面不同范围非球面性(Q值)及其与角膜球差的关系.方法 横断面研究.选取拟行角膜屈光手术的近视及近视散光患者116例(116眼),年龄18~45岁,球镜度- 1.25~-10.75 D,柱镜度0.00~-3.50 D.应用Pentacam眼前节分析系统对角膜前、后表面6、7、8、9 mm直径下的Q值及角膜球差进行测量.采用Pearson直线相关分析角膜前、后表面Q值与球差及其他参数的相关性、以及角膜前、后表面Q值的相关性,采用直线回归分析建立角膜前、后表面相应范围Q值与球差的回归方程 结果 在6~9 mm取值范围下,角膜前表面Q值分别为-0.24±0.09 、-0.29±0.09、-0.33±0.09和-0.39±0.10;后表面Q值分别为-0.12-0.12、-0.21±0.11 、-0.30±0.10和-0.38±0.10.前表面Q值较后表面Q值偏向负值方向,6~8 mm前后表面差异有统计学意义(t=- 10.35、-6.68、-3.46,P<0.01).6~9 mm取值范围下角膜前、后表面Q值均呈正相关(r=0.30、0.37、0.40、0.42,P<0.01).0值与球差存在明显的相关性,在6mm角膜直径下,前表面回归方程为SA=0.663Q+0.415,后表面回归方程为SA=0.159Q-0.177,前表面Q值为-0.60时,球差接近零.6~9 mm取值范围下,前表面Q值与与柱镜度均呈正相关(r=0.28、0.27、0.25、0.22,P<0.05).后表面7~9 mm范围内的Q值与角膜厚度呈负相关(r=-0.18、-0.21、-0.24,P<0.05)Q值与年龄、性别、眼别无相关 结论 近视眼角膜前、后表面均呈长椭圆形,前表面较后表面的长椭圆形特点更显著.Q值与球差存在正相关关系,Q值越负,球差越小.
Abstract: Objective To evaluate the asphericity of the anterior and posterior comeal surfaces in myopic eyes with different corneal diameters.Methods It was a cross-sectional study.One hundred and sixteen eyes of 116 myopic or myopic astigmatism patients were enrolled.The preo perative spherical refraction was -1.25~-10.75 D,and the cyclindrical refraction was 0.00~-3.50 D.The Q-value and spherical aberration of the anterior and posterior corneal surfaces for different corneal diameters (6,7,8,9 mm) were measured with a Pentacam.The correlations between Q-value and spherical aberration,corneal refraction and central corneal thickness were investigated usiug a Pearson correlation,and a linear regression was used to establish the regressione quation of Q-value and spherical abberration.Results The Q6 mm,Q7 mm,Q8 mm,Q9 mm of the anterior corneal surfaces of the 116 eyes were -0.24±0.09,-0.29±0.09,-0.33±0.09,-0.39±0.10,respectively; posterior corneal surfaces were -0.12±0.12,-0.21±0.11,-0.30±0.10,-0.38±0.10,respectively.The Q-values of the anterior corneal surfaces were more negative than the posterior corneal surfaces,the differences were significant except the 9 mm (t=-10.35,-6.68,-3.46,P<0.01).Positive relationships were found between the Q-value of anterior and posterior corneal surfaces for 6-9 mm corneal diameters (r=0.30,0.37,0.40,0.42,P<0.01).For a 6 mm corneal diameter,the regression equation of the anterior corneal surface was SA=0.663Q+0.415,and the posterior corneal surface was SA=0.159Q-0.177.Positive relationships were also found between the anterior Q-values and cyclinder refractions for 6-9 mm corneal diameters (r=0.28、0.27、0.25、0.22,P<0.05).Negetive relationship were found between the posterior Q value and comeal thickness for 7-9 mm corneal diameter (r=-0.18,-0.21,-0.24,P<0.05).ConcIusion Both the anterior and the posterior corneal surfaces in myopic eyes were prolate.As the corneal diameter increased,the Q-values became more negative.The relationship between Q-value and corneal spherical aberration can provide more valuable instructions for refractive surgeons when designing aspheric ablation.
作者 : 侯杰    王雁    耿维莉    金颖    左彤
Author: HOU Jie    WANG Yan    GENG Wei-li    JIN Ying    ZUO Tong
作者单位 : 300020,天津医科大学 天津市眼科医院
期 刊: 中华眼视光学与视觉科学杂志   ISTIC
Journal: Chinese Journal of Optometry Ophthalmology and Visual Science
年,卷(期) : 2012, 14(6)
分类号 : R779.63
关键词: 角膜     近视     Q值     球差    
Keywords: Cornea    Myopia    Q-value    Spherical aberration

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