Gillner M, Langenbucher A, Eppig T
Institut für Medizinische Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91052 Erlangen.
Ophthalmologe. 2012 Mar;109(3):263-70. doi: 10.1007/s00347-011-2517-4.
The image quality of aberration correcting aspherical intraocular lenses (IOLs) depends on the centration in the eye. Aberration correcting IOLs of the second generation are claimed to be more robust to decentration. In this study the image quality of such IOLs was analyzed with decentration values of up to 1 mm.
In this study two aberration correction IOLs of the second generation were compared in a model eye. The IOLs were decentered for two pupil diameters (3.0 and 4.5 mm) in a range of ± 1 mm relative to the line of sight in 50 µm steps and the modulation transfer function was calculated. The results were compared for different spatial frequencies and visual acuities.
The analyzed IOLs are superior to the spherical IOL in a decentration range from -0.45 mm to 0.60 mm (30 CPD, cycles per degree) for both pupil diameters. Especially for the greater pupil diameter the lenses show tolerance of image quality to lens decentration.
Both IOLs show only a slight decrease in image quality with decentration and the range of tolerable decentration is increased compared to aspherical IOLs of the first generation.
像差校正非球面人工晶状体（IOL）的图像质量取决于其在眼内的中心定位。第二代像差校正IOL据称对偏心更具耐受性。在本研究中，分析了此类IOL在偏心值高达1mm时的图像质量。
在本研究中，在模型眼中比较了两种第二代像差校正IOL。对于两个瞳孔直径（3.0和4.5mm），IOL相对于视线在±1mm范围内以50µm步长偏心，并计算调制传递函数。比较了不同空间频率和视力下的结果。
对于两种瞳孔直径，在-0.45mm至0.60mm（30周/度，每度周期数）的偏心范围内，所分析的IOL均优于球面IOL。特别是对于较大的瞳孔直径，晶状体显示出图像质量对晶状体偏心的耐受性。
与第一代非球面IOL相比，两种IOL在偏心时图像质量仅略有下降，且可耐受的偏心范围有所增加。
