Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Ophthalmology & Visual Sciences Key Laboratory, 1 Dongjiaominxiang Street, Dongcheng District, Beijing, 100730, China.
Eur J Med Res. 2023 Jan 11;28(1):20. doi: 10.1186/s40001-023-00998-8.
To compare the accuracy of three intraocular lens (IOL) formulas in Chinese cataract patients with prior radial keratotomy (RK).
Medical records of cataract patients with prior RK at Beijing Tongren Hospital were retrospectively analysed. The absolute error (AE) was calculated as the absolute difference between the actual postoperative spherical equivalent and the predicted spherical equivalent. The AE and percentages of eyes with AE within 0.5D, 1.0D, and 2.0D for three formulas [Barrett True-K, Holladay 1 (D-K), Haigis] were calculated and compared.
Forty-seven eyes of 28 cataract patients were included. The Median AE (MedAE) was significantly different among the three formulas (P < 0.001). The MedAE was lowest for the Barrett True-K formula (0.62), followed by the Haigis (0.76), and Holladay 1 (D-K) (1.16). The percentages of eyes with AE within 0.5D, and 1.0D were significantly different among the 3 formulas (P = 0.009, and P < 0.001). The Barrett True-K formula achieved the highest percentages (46.8%) of eyes with AE within 0.5D. Haigis achieved the highest percentages (70.21%) of eyes with AE within 1.0 D.
Barrett True-K is the most accurate IOL power calculation formula among the 3 formulas and Haigis is an alternative choice. Considering the relatively lower accuracy of IOL formulas in cataract patients with prior RK, newer and more accurate IOL formulas are desirable.
比较三种人工晶状体（IOL）公式在既往放射状角膜切开术（RK）的中国白内障患者中的准确性。
回顾性分析北京同仁医院既往行 RK 的白内障患者的病历资料。绝对误差（AE）定义为实际术后球镜等效值与预测球镜等效值的绝对值差。计算并比较三种公式[Barrett True-K、Holladay 1（D-K）、Haigis]的 AE 和 AE 在 0.5D、1.0D 和 2.0D 内的眼数百分比。
纳入 28 例白内障患者的 47 只眼。三种公式的 AE 中位数（MedAE）差异有统计学意义（P < 0.001）。Barrett True-K 公式的 MedAE 最低（0.62），其次是 Haigis（0.76），Holladay 1（D-K）最高（1.16）。三种公式的 AE 在 0.5D 和 1.0D 内的眼数百分比差异有统计学意义（P = 0.009，P < 0.001）。Barrett True-K 公式的 AE 在 0.5D 内的眼数百分比最高（46.8%）。Haigis 公式的 AE 在 1.0D 内的眼数百分比最高（70.21%）。
在三种公式中，Barrett True-K 是最准确的 IOL 屈光力计算公式，Haigis 是另一种选择。考虑到既往 RK 的白内障患者 IOL 公式的准确性相对较低，需要更准确的新型 IOL 公式。
