Effect of decentration and tilt on the image quality of aspheric intraocular lens designs in a model eye
Effect of decentration and tilt on the image quality of aspheric intraocular lens designs in a model eye
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DOI：
10.1016/j.jcrs.2009.01.034
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发表时间：
2009-06-01
影响因子：
2.8
通讯作者：
Langenbucher, Achim
中科院分区：
文献类型：
--
作者：
Eppig, Timo;Scholz, Katja;Langenbucher, Achim
目得：确定偏心和倾斜对非球面人工透镜（IOL）设计在示意性模型eye.SETTING成像质量的影响：医学物理研究所，埃尔朗根-纽伦堡大学，埃尔兰根，德国。用具有22.0屈光度标称屈光力的IOL设计替换模型眼中的晶体透镜，并将前房深度（ACID）设定为制造商提供的估计ACID值。为了获得最佳图像质量，对视网膜位置进行了优化。IOL偏心达+/- 1.0 mm，相对于视线倾斜达+/- 5度。在每个位置处，用3.0 mm和4.5 mm瞳孔直径记录调制传递函数。结果：像差矫正型人工晶状体对偏心和倾斜非常敏感。然而，错位的影响取决于IOL设计。无像差的IOL显示出较低的灵敏度在一个广泛的位移范围内，但提供了更好的结果比球形ILO.CONCLUSIONS：总体而言，现代非球面IOL提供了更好的成像质量比传统的球形IOL设计。无像差IOL对偏心和倾斜的敏感性低于像差矫正IOL，但提供的图像质量优于球面IOL。当完全对准时，像差矫正IOL有可能提供衍射限制成像质量。
PURPOSE: To determine the impact of decentration and tilt on the imaging quality of aspheric intraocular lens (IOL) designs in a schematic model eye.SETTING: Institute of Medical Physics, University of Erlangen-Nuremberg, Erlangen, Germany.METHOD: A model eye was used to calculate the impact of misalignment on the imaging quality of 6 IOL designs. The crystalline lens in the model eye was replaced with IOL designs with 22.0 diopters nominal refractive power, and the anterior chamber depth (ACID) was set to the estimated ACID value provided by the manufacturer. The retinal position was optimized for the best image quality. The IOLs were decentered up to +/- 1.0 mm and tilted up to +/- 5 degrees relative to the line of sight. At each position, the modulation transfer function was recorded with 3.0 mm and 4.5 mm pupil diameters. The results between the IOL designs and those of the phakic model eye were then compared.RESULTS: Aberration-correcting IOLs were very sensitive to decentration and tilt. However, the impact of misalignment depended on IOL design. Aberration-free IOLs showed less sensitivity within a wide range of displacement but provided better results than the spherical IOL.CONCLUSIONS: Overall, modern aspheric IOLs provided better imaging quality than conventional spherical IOL designs. Aberration-free IOLs were less sensitive to decentration and tilt than aberration-correcting IOLs but provided better image quality than spherical IOLs. Aberration-correcting IOLs have the potential to provide diffraction-limited imaging quality when perfectly aligned.