Kabata Yoshiaki, Oki Tetsutaro, Nakano Tadashi
Department of Ophthalmology, Jikei University School of Medicine, Daisan Hospital, Tokyo, Japan.
Department of Ophthalmology, The Jikei University School of Medicine, Tokyo, Japan.
Clin Ophthalmol. 2024 Mar 21;18:895-900. doi: 10.2147/OPTH.S455178. eCollection 2024.
To evaluate the refractive prediction error in flanged intrascleral intraocular lens (IOL) fixation using the SRK/T formula and compare the axial length using a single IOL.
Seventy-six eyes from 70 patients (45 males and 25 females) were included in this study. The mean age at the time of surgery was 73.4 ±12.3 years. The patients underwent flanged IOL fixation using a PN6A (Kowa). All surgeries were performed by two surgeons (Y. K. and T. O.) between Jan 2020 and Dec 2022 at Jikei University Daisan Hospital. IOL power was calculated using the SRK/T formula with IOL Master 700 (Carl Zeiss) as the bag power. The recommended value of 119.0 was used for the A-constant. The actual refractive spherical equivalent was calculated and compared with preoperative predictions. Refractive prediction errors were defined as the deviation of the actual postoperative spherical equivalent refraction in diopters from the predicted preoperative spherical equivalent refraction. The patients were divided into three groups according to axial length: <22.0 mm (short eyes), 22.0-24.5 mm (medium eyes), and >24.5 mm (long eyes), and the refractive prediction errors and mean absolute errors were compared.
The mean refractive prediction error was -0.20 ± 0.52D. The mean absolute error was 0.44 ± 0.33D. The mean refractive prediction errors were not significantly different between the 22.0-24.5 mm (medium eyes) and >24.5 mm (long eyes) groups. (P=0.06) The mean absolute errors were not significantly different between the two groups (P=0.10).
The SRK/T formula worked well regardless of whether the eyes were medium or long according to the axial length in the flanged intrascleral IOL fixation.
使用SRK/T公式评估带凸缘巩膜内人工晶状体（IOL）固定术的屈光预测误差，并比较使用单一IOL时的眼轴长度。
本研究纳入了70例患者（45例男性和25例女性）的76只眼。手术时的平均年龄为73.4±12.3岁。患者接受了使用PN6A（Kowa）的带凸缘IOL固定术。所有手术均由两名外科医生（Y.K.和T.O.）于2020年1月至2022年12月在东京慈惠会医科大学第三医院进行。使用IOL Master 700（卡尔蔡司）作为囊袋屈光力，通过SRK/T公式计算IOL屈光力。A常数使用推荐值119.0。计算实际屈光球镜等效度并与术前预测值进行比较。屈光预测误差定义为术后实际球镜等效度屈光度数与术前预测球镜等效度屈光度数的偏差。根据眼轴长度将患者分为三组：<22.0 mm（短眼）、22.0 - 24.5 mm（中眼）和>24.5 mm（长眼），并比较屈光预测误差和平均绝对误差。
平均屈光预测误差为-0.20±0.52D。平均绝对误差为0.44±0.33D。22.0 - 24.5 mm（中眼）组和>24.5 mm（长眼）组之间的平均屈光预测误差无显著差异（P = 0.06）。两组之间的平均绝对误差无显著差异（P = 0.10）。
在带凸缘巩膜内IOL固定术中，无论眼轴长度是中眼还是长眼，SRK/T公式的效果都很好。
