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目的了解国人近视眼患者中角膜散光与眼二阶波阵面像差的关系以及角膜散光在眼像差组成中的影响和作用。方法使用 Shack-Hartmann 原理设计的 WASCA 波阵面像差分析仪检测246例门诊患者484只近视散光眼的眼像差,6.0mm 瞳孔直径下,以第三、五项 Zernike 系数(C_3和C_5)进行分析;使用 Humphrey 角膜地形图对484只眼进行检测,获得角膜散光度数,分为顺规(包括0°与180°两类)、逆规、斜轴(包括45°与135°两类)5组角膜散光,各自矢量分解为 J_(45)(轴在45°或135°的 JCC 柱镜)与 J_0(轴在90°或180°的 JCC 柱镜)后分别与第二阶像差进行相关分析。结果由矢量分析所得的各组角膜散光平均值分别为-1.34D×6.87°、-1.03D×23.15°、-0.48D×89.55°、-0.91D×156.87°、-1.02D×176.74°;各组角膜散光的 J_(45)和 J_0值分别与 C_3和 C_5呈线性相关,其中 J_(45)与 C_3的线性回归公式确定系数 R~2依次为0.138、0.119、0.090、0.526、0.501;J_0与 C_5的确定系数 R~2依次为0.711、0.736、0.864、0.866、0.785。结论角膜散光与眼二阶波阵面像差关系密切,两者的相关呈散光轴向依赖性。角膜散光与眼内散光的不同互补和叠加模式随散光轴向的变化而规律变化。
Objective To understand the relationship between corneal astigmatism and ocular second-order wavefront aberrations in Chinese myopic patients and the effect of corneal astigmatism on the composition of ocular aberrations. Methods The WASCA wavefront aberrometry analyzer designed by Shack-Hartmann principle was used to detect the ocular aberrations of 484 myopic astigmatism patients in 246 outpatients. Under the pupil diameter of 6.0 mm, the third and fifth Zernike coefficients (C_3 and C_5) The Hypophagus was used to detect 484 eyes. The degree of corneal astigmatism was obtained and classified into the following categories (including 0 ° and 180 °), inverse rules, oblique axis (including 45 ° and 135 °) Corneal astigmatism was performed in each of the 5 groups with respective vector resolutions of J_ (45) (JCC cylinders with axes at 45 ° or 135 °) and J_0 (JCC cylinders with axes at 90 ° or 180 °) followed by second-order aberrations related analysis. Results The mean values of corneal astigmatism obtained by vector analysis were -1.34D × 6.87 °, -1.03D × 23.15 °, -0.48D × 89.55 °, -0.91D × 156.87 °, -1.02D × 176.74 ° respectively; The values of J_ (45) and J_0 in corneal astigmatism were linearly correlated with C_3 and C_5, respectively. The linear regression formula of J_ (45) and C_3 was 0.138,0.119,0.090,0.526,0.501, The determination coefficient of C_5, R ~ 2, is 0.711,0.736,0.864,0.866,0.785. Conclusion Corneal astigmatism is closely related to ocular second-order wavefront aberration, the correlation between the two is axial astigmatism. The different patterns of complementarity and superposition of corneal astigmatism and astigmatism change regularly with axial changes of astigmatism.