Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.
Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.
J Cataract Refract Surg. 2019 Oct;45(10):1416-1421. doi: 10.1016/j.jcrs.2019.05.020. Epub 2019 Aug 6.
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.
Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.
Retrospective case series.
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.
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.
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.
比较经扫频源光相干断层生物测量仪测量的总角膜曲率（TK）和标准角膜曲率（K）在既往角膜屈光手术眼的人工晶状体（IOL）屈光力计算中的准确性。
美国德克萨斯州休斯顿贝勒医学院 Cullen 眼科研究所。
回顾性病例系列。
评估 TK 与 K 的差异及其与 K 的相关性。用于 IOL 屈光力计算的组合 1）K 与 Haigis、Haigis-L 和 Barrett True-K，和 2）TK 与 Haigis（Haigis-TK）。计算平均绝对误差（MAE）和预测误差在±0.50 屈光度（D）、±1.00 D 和±2.00 D 内的眼数百分比。
本研究共纳入 129 只眼。对于 Haigis、Haigis-L、Barrett True-K 和 Haigis-TK，分别在近视激光原位角膜磨镶术（LASIK）/光性角膜切削术（PRK）组中 MAE 为 0.72 D、0.61 D、0.54 D 和 0.50 D，在远视 LASIK/PRK 组中 MAE 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，Haigis、Barrett True-K 和 Haigis-TK 公式的 MAE 分别为 0.66 D、0.71 D 和 0.72 D。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，公式之间的 MAE 和预测误差内眼数百分比没有显著差异。
在既往角膜屈光手术眼，Haigis 和 TK 的组合在屈光预测中的性能与 Haigis-L 和 Barrett True-K 相当。
