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Intraocular lens power calculation in eyes with previous corneal refractive surgery

机译:先前进行过角膜屈光手术的眼睛的人工晶状体屈光力计算

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Background This review aims to explain the reasons why intraocular lens (IOL) power calculation is challenging in eyes with previous corneal refractive surgery and what solutions are currently available to obtain more accurate results. Review After IOL implantation in eyes with previous LASIK, PRK or RK, a refractive surprise can occur because i) the altered ratio between the anterior and posterior corneal surface makes the keratometric index invalid; ii) the corneal curvature radius is measured out of the optical zone; and iii) the effective lens position is erroneously predicted if such a prediction is based on the post-refractive surgery corneal curvature. Different methods are currently available to obtain the best refractive outcomes in these eyes, even when the perioperative data (i.e. preoperative corneal power and surgically induced refractive change) are not known. In this review, we describe the most accurate methods based on our clinical studies. Conclusions IOL power calculation after myopic corneal refractive surgery can be calculated with a variety of methods that lead to relatively accurate outcomes, with 60 to 70% of eyes showing a prediction error within 0.50 diopters.
机译:背景技术这篇综述旨在解释为什么在以前的角膜屈光手术的眼中,人工晶状体(IOL)屈光力计算具有挑战性的原因,以及目前有哪些解决方案可以获得更准确的结果。回顾在将人工晶状体植入具有先前的LASIK,PRK或RK的眼睛后,可能会发生屈光不正,这是因为: ii)在光学区域之外测量角膜曲率半径; iii)如果基于屈光手术后角膜曲率的预测是错误地预测了有效晶状体位置。即使不知道围手术期的数据(即术前角膜屈光度和手术引起的屈光改变),目前也有不同的方法可以使这些眼获得最佳的屈光效果。在这篇综述中,我们根据临床研究描述了最准确的方法。结论近视角膜屈光手术后的IOL屈光力计算可采用多种方法得出相对准确的结果,其中60%至70%的眼睛预测屈光度在0.50屈光度以内。

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