人工晶状体屈光度计算：一个具有挑战性的病例。
Intraocular lens power calculation: a challenging case.
作者信息
Rosa Nicola, De Bernardo Maddalena, Iaccarino Stefania, Cennamo Michela
机构信息
*MD Department of Medicine and Surgery, University of Salerno, Salerno, Italy (NR, SI, MC); PhD Program in Experimental and Reconstructive Surgery, Second University of Naples, Naples, Italy (MDB).
出版信息
Optom Vis Sci. 2014 Feb;91(2):e29-31. doi: 10.1097/OPX.0000000000000127.
PURPOSE
To highlight different methods in calculating intraocular lens (IOL) power in the case of undetectable keratometric (K) readings.
CASE REPORT
A 54-year-old woman was referred to us for cataract surgery in her left eye. The slit lamp examination revealed the presence of corneal scars that did not allow us to take reliable K readings. To calculate them, the following regression formula was used: K= Rx-42.613/-0.0424*AL. The IOL power calculation was performed aiming at a postoperative error = -0.5 diopters. One month after surgery, the uncorrected visual acuity was 20/100 and the best spectacles corrected visual acuity was 20/25 with +1.0 -4 × 180 (-1.0 diopter spherical equivalent).
CONCLUSIONS
This seems to be a reliable method to calculate the IOL power when K readings are undetectable, but to make a definitive statement, prospective studies are needed.
目的
强调在无法检测到角膜曲率（K）读数的情况下计算人工晶状体（IOL）屈光度的不同方法。
病例报告
一名54岁女性因左眼白内障手术转诊至我院。裂隙灯检查发现角膜瘢痕，无法获取可靠的K读数。为计算K读数，使用了以下回归公式：K = Rx - 42.613 / -0.0424 * AL。人工晶状体屈光度计算旨在使术后误差为-0.5屈光度。术后1个月，未矫正视力为20/100，最佳眼镜矫正视力为20/25，散光度数为+1.0 -4×180（等效球镜度数为-1.0屈光度）。
结论
当无法检测到K读数时，这似乎是一种计算人工晶状体屈光度的可靠方法，但要得出明确结论，还需要进行前瞻性研究。
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