Accuracy of intraocular lens power formulas in patients with average keratometry greater than 46 diopters

Archivos de la Sociedad Espanola de Oftalmologia Pub Date : 2024-10-01 DOI:10.1016/j.oftale.2024.07.006

H. Rodríguez Ortiz , L. Flores Ortiz , R. Devereux García , C. Palacio Pastrana , M. Hilario Pérez , G. Villanueva Pérez , J.M. Piña Valdez , G.Y. Montalvo Domínguez , L.P. Gutierrez Díaz

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Abstract

Objective

To compare the accuracy of Kane, Barrett Universal II, Haigis, and SRK-T formulas in eyes with average keratometry greater than 46 diopters (D).

Methods

A retrospective analysis was conducted on 101 eyes of 101 patients with average keratometry greater than 46 D. The absolute prediction error (EA) was obtained for each patient one month after surgery. The mean absolute prediction error (MEA), median absolute prediction error (MedEA) and the percentage of patients with absolute refractive error less than 0.25 D, 0.50 D, and 1.00 D were calculated for each formula analyzed.

Results

The Kane formula achieved the lowest MEA (0.53 ± 0.43) and the lowest MedEA (0.41), followed by Barrett Universal II (MEA: 0.56 ± 0.42, MedEA: 0.49), SRK-T (MEA: 0.59 ± 0.44, MedEA: 0.54), and Haigis (MEA: 0.77 ± 0.47, MedEA: 0.69), showing a significant difference in the results. It was also observed that the Kane formula was the most accurate, with the highest percentage of patients, with EA less than 0.25 D, 0.50 D, and 1.00 D (30.7%, 54.4%, and 86.1%, respectively), while the Haigis formula was the least accurate (12.9%, 33.7%, and 69.3%, respectively).

Conclusion

In eyes with corneas having average keratometry greater than 46 D, the Kane formula proves to be a useful tool in intraocular lens (IOL) power calculation and demonstrates higher precision compared to the Barrett Universal II, SRK-T, and Haigis formulas.

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平均角膜度数大于 46 度的患者眼内晶状体功率公式的准确性。

目的：比较凯恩公式、巴雷特通用 II 公式、海吉斯公式和 SRK-T 公式对平均角膜度数大于 46 度 (D) 眼睛的准确性：比较 Kane、Barrett Universal II、Haigis 和 SRK-T 公式在平均角膜度数大于 46 度 (D) 的眼睛中的准确性：对平均角膜度数大于 46 D 的 101 名患者的 101 只眼睛进行了回顾性分析。计算了每个分析公式的平均绝对预测误差（MEA）、中位数绝对预测误差（MedEA）以及绝对屈光误差小于 0.25 D、0.50 D 和 1.00 D 的患者比例：Kane 公式的 MEA（0.53 ± 0.43）和 MedEA（0.41）最低，其次是 Barrett Universal II（MEA：0.56 ± 0.42，MedEA：0.49）、SRK-T（MEA：0.59 ± 0.44，MedEA：0.54）和 Haigis（MEA：0.77 ± 0.47，MedEA：0.69），结果显示差异显著。同时还观察到，凯恩公式的准确度最高，EA小于0.25 D、0.50 D和1.00 D的患者比例最高（分别为30.7%、54.4%和86.1%），而海吉斯公式的准确度最低（分别为12.9%、33.7%和69.3%）：结论：对于平均角膜屈光度大于 46 D 的眼睛，Kane 公式被证明是计算人工晶体（IOL）功率的有用工具，与 Barrett Universal II、SRK-T 和 Haigis 公式相比，Kane 公式的精确度更高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Archivos de la Sociedad Espanola de Oftalmologia

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