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[摘要]
随着屈光不正患者数量的增加及角膜屈光手术的盛行，越来越多早期选择角膜屈光手术(LASIK/PRK)矫正高度近视的患者如今面临着白内障手术，然而，用常规方法计算这部分患者的人工晶状体度数往往是不精确的。目前的第三代和第四代公式过高地估计了角膜屈光力，导致人工晶状体度数矫正不足，从而出现术后的远视漂移。而传统的角膜地形图采用2.5～3.2mm范围环上的角膜计算角膜屈光力，忽略了角膜中央的真实曲率，导致角膜屈光术后尤其是偏中心切削患者术后出现严重的屈光误差。本文旨在总结LASIK/PRK术后患者人工晶状体度数计算最新的误差来源以及最新计算方法，为提高屈光术后患者人工晶状体度数计算的准确性提供更多的选择。
[Key word]
[Abstract]
Calculating the intraocular lens(IOL)power in eyes with prior corneal refractive surgery(LASIK/PRK)is still a challenging task for all cataract ophthalmologists. The accuracy of the IOL power calculating is lower than virgin eyes, because the three generation formulae and traditional corneal instruments which measure central corneal radius of curvature in the paracentral 2.5-3.2mm zone are incorrect after myopic refractive surgery. There are three main sources of error in IOL calculation after refractive surgery: the radius measurement error, the keratometer index error and the IOL formula error. The purpose of the present paper is to describe the different available techniques to improve the accuracy of the IOL power calculation after refractive procedures.
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