PURPOSE To compare the accuracy of total keratometry (TK) and standard keratometry (K) from a swept-source optical coherence tomography biometer for intraocular lens (IOL) power calculation in eyes with previous corneal refractive surgery. SETTING Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA. DESIGN Retrospective case series. METHODS The differences between the TK and K and their association with K were assessed. For IOL power calculation, combinations of 1) K with Haigis, Haigis-L, and Barrett True-K, and 2) TK with Haigis (Haigis-TK) were used. The mean absolute error (MAE) and the percentages of eyes within prediction errors of ± 0.50 diopters (D), ± 1.00 D, and ± 2.00 D were calculated. RESULTS The study comprised 129 eyes. For Haigis, Haigis-L, Barrett True-K, and Haigis-TK, respectively, the MAEs were 0.72 D, 0.61 D, 0.54 D, and 0.50 D in the myopic laser in situ keratomileusis (LASIK)/photorefractive keratectomy (PRK) group, and 0.74 D, 0.68 D, 0.71 D, and 0.70 D in hyperopic LASIK/PRK group. For the radial keratotomy (RK) eyes, the MAEs were 0.66 D, 0.71 D, and 0.72 D for the Haigis, Barrett True-K, and Haigis-TK formulas, respectively. In the myopic LASIK/PRK group, the Barrett True-K and Haigis-TK produced significantly lower MAEs than did Haigis (P < .05). In the hyperopic LASIK/PRK and RK groups, there were no significant differences between the formulas in MAEs and percentages of eyes within the above prediction errors. CONCLUSIONS The performance of the combination of Haigis and TK in refractive prediction was comparable with Haigis-L and Barrett True-K in eyes with previous corneal refractive surgery.

中文翻译：

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评估角膜屈光手术后眼睛的总角膜测量法及其在眼内屈光度计算中的准确性。

目的比较以前采用角膜屈光手术的人眼中的人工晶状体（IOL）屈光度的扫频光学相干断层扫描生物计的总角膜曲率法（TK）和标准角膜曲率法（K）的准确性。地点美国德克萨斯州休斯敦贝勒医学院卡伦眼科研究所。设计回顾案系列。方法评估了TK和K之间的差异以及它们与K的关联。对于IOL功率计算，使用了1）K与Haigis，Haigis-L和Barrett True-K的组合，以及2）TK与Haigis（Haigis-TK）的组合。计算了平均绝对误差（MAE）和在±0.50屈光度（D），±1.00 D和±2.00 D的预测误差内的眼睛百分比。结果该研究包括129只眼睛。对于Haigis，Haigis-L，Barrett True-K和Haigis-TK，MAE分别为0.72 D，0。近视激光原位角膜磨镶术（LASIK）/光折射角膜切除术（PRK）组为61 D，0.54 D和0.50 D，远视LASIK / PRK组为0.74 D，0.68 D，0.71 D和0.70 D. 对于放射状角膜切开术（RK）眼，对于Haigis，Barrett True-K和Haigis-TK公式，MAE分别为0.66 D，0.71 D和0.72D。在近视LASIK / PRK组中，Barrett True-K和Haigis-TK产生的MAE明显低于Haigis（P <.05）。在远视LASIK / PRK和RK组中，在上述预测误差范围内，MAE的公式与眼睛的百分比之间没有显着差异。结论在进行过角膜屈光手术的眼睛中，Haigis和TK的组合在屈光预测中的表现与Haigis-L和Barrett True-K相当。近视激光原位角膜磨镶术（LASIK）/光折射角膜切除术（PRK）组为50 D，远视LASIK / PRK组为0.74 D，0.68 D，0.71 D和0.70D。对于放射状角膜切开术（RK）眼，对于Haigis，Barrett True-K和Haigis-TK公式，MAE分别为0.66 D，0.71 D和0.72D。在近视LASIK / PRK组中，Barrett True-K和Haigis-TK产生的MAE明显低于Haigis（P <.05）。在远视LASIK / PRK和RK组中，在上述预测误差范围内，MAE的公式与眼睛的百分比之间没有显着差异。结论在进行过角膜屈光手术的眼睛中，Haigis和TK的组合在屈光预测方面的表现与Haigis-L和Barrett True-K相当。近视激光原位角膜磨镶术（LASIK）/屈光性角膜切除术（PRK）组为50 D，远视LASIK / PRK组为0.74 D，0.68 D，0.71 D和0.70D。对于放射状角膜切开术（RK）眼，对于Haigis，Barrett True-K和Haigis-TK公式，MAE分别为0.66 D，0.71 D和0.72D。在近视LASIK / PRK组中，Barrett True-K和Haigis-TK产生的MAE明显低于Haigis（P <.05）。在远视LASIK / PRK和RK组中，在上述预测误差范围内，MAE的公式与眼睛的百分比之间没有显着差异。结论在进行过角膜屈光手术的眼睛中，Haigis和TK的组合在屈光预测方面的表现与Haigis-L和Barrett True-K相当。