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薄晶体公式与光线跟踪方法计算IOL度数不相上下

Issue: July 2009

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在计算正常眼睛和做过屈光手术眼睛的IOL度数方面，薄晶体公式已被证明与光线跟踪方法不相上下。据德国海德堡国际视力矫正研 究中心及位于中国广州的广东省人民医院眼科的研究作者称，术前预测IOL的位置在计算IOL度数中有着关键作用。

“鉴于光线跟踪方法的操作更复杂，需要更多的参数，故有人建议用这种薄晶体方法计算IOL度数，”他们说：“由于光线跟踪方法能解释人眼的[高阶像差]，故可在评价人工晶体眼视觉质量和设计定制IOL中大展身手。”

这项回顾性研究包括302只正常角膜及25只做过近视眼LASIK或PRK的角膜。正常角膜组包括52例白内障患者。

研究者使用Haigis, Hoffer Q, Norrby及Olsen 2公式预测IOL的位置及前房深度。他们使用Scheimpflug照相术测量角膜半径及角膜表面高度。

数据显示的薄晶体公式的平均绝对预测误差如下：Haigis为0.64 D, Hoffer Q为0.57 D, Norrby为0.59 D, Olsen 2为0.61 D。正常光线跟踪方法的平均绝对预测误差则是，Haigis为0.64 D, Hoffer Q为0.58 D, Norrby为0.59 D, Olsen 2为0.62 D。两种方法无统计学差异。

Reference:

• Jin H, Rabsilber T, Ehmer A, Borkenstein AF, Limberger IJ, Guo H, Auffarth GU. Comparison of ray-tracing method and thin-lens formula in intraocular lens power calculations. J Cataract Refract Surg. 2009;35(4):650-662.