PURPOSE To determine and compare the origin of the external surface reflections produced by commonly used intraocular lenses (IOLs). METHODS The specular reflection taking place at the anterior surface of eight types of IOLs (IOL power = 22.00 diopters [D]) with different refractive indices (RIs), optical design, and ultraviolet and blue light-filtering function were measured. The experimental set-up included a laser beam light source (3.5 mW, 532 nm) and a saline-filled model eye containing the IOL to be examined. External surface reflections were measured using a power meter, and the IOL surface reflectance (%) was compared among the eight IOLs investigated. RESULTS External reflections from the anterior surface of the studied implants increased as the RI of the IOL material increased. The IOL models composed of high RI material (RI = 1.56 ± 0.02) were found to have a more than threefold higher external surface reflections compared to those with low RI (RI = 1.45 ± 0.02). Ultraviolet or blue light-filtering functions showed no significant correlation with the external reflectance. CONCLUSIONS IOLs with a high RI are associated with external surface reflections that are more than threefold higher than those with lower RI. The "cat's eye" phenomenon seen in pseudophakic eyes by an outside observer strongly depends on the RI, but is independent of the filter incorporated in the IOL. [J Refract Surg. 2021;37(6):398-402.].

中文翻译：

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人工晶状体折射率及其对外表面反射的影响。

目的 确定和比较常用人工晶状体 (IOL) 产生的外表面反射的起源。方法 测量了具有不同折射率 (RI)、光学设计以及紫外和蓝光过滤功能的 8 种类型的人工晶状体（人工晶状体屈光度 = 22.00 屈光度 [D]）前表面发生的镜面反射。实验装置包括一个激光束光源 (3.5 mW, 532 nm) 和一个装有待检查 IOL 的充满盐水的模型眼睛。使用功率计测量外表面反射，并比较所研究的八种人工晶状体之间的人工晶状体表面反射率 (%)。结果 随着人工晶状体材料的 RI 增加，来自所研究植入物前表面的外部反射增加。由高 RI 材料（RI = 1.56 ± 0. 02) 与低 RI (RI = 1.45 ± 0.02) 相比，外表面反射高出三倍以上。紫外线或蓝光过滤功能与外部反射率没有显着相关性。结论 具有高 RI 的 IOL 与外表面反射相关，其比具有较低 RI 的 IOL 高三倍以上。外部观察者在人工晶状体眼中看到的“猫眼”现象强烈依赖于 RI，但与 IOL 中的滤光片无关。[J 屈光手术。2021;37(6):398-402.]。结论 具有高 RI 的 IOL 与外表面反射相关，其比具有较低 RI 的 IOL 高三倍以上。外部观察者在人工晶状体眼中看到的“猫眼”现象强烈依赖于 RI，但与 IOL 中的滤光片无关。[J 屈光手术。2021;37(6):398-402.]。结论 具有高 RI 的 IOL 与外表面反射相关，其比具有较低 RI 的 IOL 高三倍以上。外部观察者在人工晶状体眼中看到的“猫眼”现象强烈依赖于 RI，但与 IOL 中的滤光片无关。[J 屈光手术。2021;37(6):398-402.]。