多焦点人工晶体成像质量的影响因素研究

摘要

In the use of MIOL (Multifocal Intraocular Lens), there are three main influencing factors of imaging quality, which are the pupil diameter, posterior chamber depth, and the related eccentricity and tilt. This paper uses the ZEMAX to establish a MIOL eye model by replacing Liou&Brennan eye model’s former lens with ReZoom MIOL, simulate changes in factors, calculate the MTF, dissertates the four factors in theory and analyzes the degree of inlfuence. The main results are as follows:after the MIOL implantation in the human eye, the posterior chamber depth, pupil diameter, tilt and eccentricity all have inlfuence on the imaging quality. The patient who has pupil diameter of 2 mm and posterior chamber depth of 7.8 mm has the best image quality. As the pupil diameter and posterior chamber depth increases, the image quality decreased. In addition, lens tilt and eccentricity will cause a decline in image quality, but less than 3 degrees tilt has little effect on the imaging results.%在多焦点人工晶体实际使用中，影响其成像质量的因素主要有：瞳孔直径、后房深度以及由此引起的偏心、倾斜等。本文通过ZEMAX软件在Liou&Brennan眼模型基础上进行改进，用ReZoom多焦点人工晶体替代眼模型原有晶体，建立多焦点人工晶体眼模型，模拟上述影响因素的变化，计算不同条件下MTF传递函数并进行比较分析，归纳出各因素对于成像质量的影响。主要结果如下：多焦点人工晶体植入人眼后，后房深度、瞳孔直径、倾斜和偏心对成像质量均有影响。对于后房深度7.8 mm，瞳孔直径2 mm左右的患者，成像质量最佳，随着瞳孔直径和后房深度的增加，成像质量逐渐下降；另外，如果出现晶体的倾斜和偏心，都会引起成像质量的下降，在倾斜范围3°以内，对成像效果的影响不大。