Apparent accommodation and corneal wavefront aberration in pseudophakic eyes.
Apparent accommodation and corneal wavefront aberration in pseudophakic eyes.
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发表时间：
2002-09
影响因子：
4.4
通讯作者：
T. Oshika;T. Mimura;Sumiyoshi Tanaka;S. Amano;M. Fukuyama;F. Yoshitomi;N. Maeda;T. Fujikado;Y. Hirohara;T. Mihashi
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作者：
T. Oshika;T. Mimura;Sumiyoshi Tanaka;S. Amano;M. Fukuyama;F. Yoshitomi;N. Maeda;T. Fujikado;Y. Hirohara;T. Mihashi
目的 评估人工晶状体眼的表观调节、多焦点角膜效应和角膜波前像差之间的关系。方法对86例接受白内障超声乳化吸除术和后房型人工晶状体植入术的患者的102只眼，用调节计测量表观调节量。通过测量瞳孔区域内的最大和最小角膜屈光力来确定角膜地形图的角膜多焦点程度。通过将角膜地形图的高度数据展开为个体瞳孔大小的泽尼克多项式来计算角膜的波前像差。通过像差函数计算点扩散函数（PSF）和调制传递函数（MTF）来模拟高阶像差对视网膜图像质量的影响。结果表观调节量与角膜多焦点呈显着正相关（Pearson相关系数，r=0.451，P<0.001）。类慧差与表观调节量呈显着正相关（r = 0.440，P < 0.001），但类球差则不然（r = 0.001，P = 0.993）。在类慧差像差中，代表角膜屈光力垂直不对称分布且位于眼睛下部屈光度较大的分量与表观调节最相关。 PSF 和 MTF 的计算机模拟表明，0.5 D 的焦点偏移使没有高阶像差的眼睛的视网膜图像恶化程度明显高于具有中等彗形像差的眼睛。结论 角膜的彗差样像差以及角膜多焦性有助于人工晶状体眼的明显调节。
PURPOSE To assess the relationship between apparent accommodation in pseudophakic eyes, multifocal corneal effects, and wavefront aberrations of the cornea. METHODS In 102 eyes of 86 patients who had undergone phacoemulsification and posterior chamber intraocular lens implantation, the amount of apparent accommodation was measured with an accommodometer. The degree of corneal multifocality was determined on the corneal topography by measuring the maximum and minimum corneal refractive powers within the pupillary area. Wavefront aberrations of the cornea were calculated by expanding the height data of the corneal topography into Zernike polynomials for individual pupil size. The influence of higher-order aberration on the retinal image quality was simulated by computing the point-spread function (PSF) and modulation-transfer function (MTF) from the aberration function. RESULTS There was a significant positive correlation between the amount of apparent accommodation and corneal multifocality (Pearson correlation coefficient, r = 0.451, P < 0.001). The coma-like aberration showed a significant positive correlation with the amount of apparent accommodation (r = 0.440, P < 0.001), but the spherical-like aberration did not (r = 0.001, P = 0.993). Among the coma-like aberrations, the component representing vertically asymmetrical distribution of corneal refractive power with greater refraction located in the lower part of the eye was most relevant to apparent accommodation. Computer simulation of PSF and MTF indicated that a focus shift of 0.5 D deteriorated the retinal image significantly more in eyes without higher-order aberrations than in eyes with a moderate amount of coma-like aberrations. CONCLUSIONS Coma-like aberration of the cornea, along with corneal multifocality, contributes to apparent accommodation in pseudophakic eyes.