Impact of ICL Fixation Direction on Postoperative Vault and Prediction Accuracy Using the KS Formula.

IF 3 3区医学 Q1 OPHTHALMOLOGY

Journal of refractive surgery Pub Date : 2025-09-01 DOI:10.3928/1081597X-20250624-06

Shuntaro Tsunehiro, Kimiya Shimizu, Masahide Takahashi, Misae Ito, Aya Saito

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引用次数: 0

Abstract

Purpose: To compare postoperative vault measurements between horizontal and vertical fixation of the Implantable Collamer Lens (ICL) (KS-AquaPORT; STAAR Surgical) when its size is determined using the KS formula.

Methods: This retrospective study analyzed 2,343 eyes from 1,275 patients who underwent myopic ICL implantation. Pre-operative anterior segment optical coherence tomography (AS-OCT) (CASIA 2; Tomey Corporation) was performed in both horizontal and vertical orientations. ICL size was determined using the KS formula integrated into the imaging device, and postoperative vault measurements were compared between horizontal and vertical fixation groups.

Results: The mean postoperative vault was significantly larger in the horizontal fixation group (0.50 ± 0.20 mm) compared to the vertical fixation group (0.43 ± 0.17 mm; P < .001). The proportion of eyes with an extraordinarily high vault (⩾ 1 mm) was significantly higher in the horizontal fixation group (7 of 827 eyes; 0.85%) than in the vertical fixation group (2 of 1,516 eyes; 0.13%; P = .012). Prediction error was also significantly greater in the horizontal group (0.08 ± 0.16 vs 0.06 ± 0.14 mm; P < .001). Similarly, the median absolute error was significantly larger in the horizontal group (0.108 vs 0.085 mm; P < .001).

Conclusions: When ICL sizing is determined using the KS formula, horizontal fixation results in a larger postoperative vault and lower prediction accuracy compared to vertical fixation. These findings support vertical fixation as a potentially safer and more predictable approach for ICL implantation.

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ICL固定方向对术后拱顶的影响及应用KS公式预测精度。

目的：比较使用KS公式确定植入式晶体（ICL）尺寸时，水平和垂直固定ICL （KS- aquaport; STAAR Surgical）的术后穹弓测量值。方法：回顾性分析1275例近视ICL植入术患者2343只眼。术前进行水平和垂直方向的前段光学相干断层扫描（AS-OCT）（CASIA 2; Tomey Corporation）。使用集成到成像装置中的KS公式确定ICL大小，并比较水平和垂直固定组之间的术后穹隆测量值。结果：水平固定组术后平均穹窿（0.50±0.20 mm）明显大于垂直固定组（0.43±0.17 mm, P < 0.001）。在水平固定组（827只眼睛中的7只；0.85%）中，具有非常高的穹窿（大于或等于1毫米）的眼睛比例显著高于垂直固定组（1,516只眼睛中的2只；0.13%;P = 0.012）。水平组的预测误差也显著大于水平组（0.08±0.16 vs 0.06±0.14 mm; P < 0.001）。同样，水平组的中位绝对误差显著大于水平组（0.108 vs 0.085 mm; P < 0.001）。结论：当使用KS公式确定ICL的大小时，与垂直固定相比，水平固定导致更大的术后拱顶和更低的预测精度。这些发现支持垂直固定作为ICL植入更安全、更可预测的方法。

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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来源期刊

$Journal of refractive surgery$

Journal of refractive surgery 医学-外科

CiteScore

5.10

自引率

12.50%

发文量

160

审稿时长

4-8 weeks

期刊介绍： The Journal of Refractive Surgery, the official journal of the International Society of Refractive Surgery, a partner of the American Academy of Ophthalmology, has been a monthly peer-reviewed forum for original research, review, and evaluation of refractive and lens-based surgical procedures for more than 30 years. Practical, clinically valuable articles provide readers with the most up-to-date information regarding advances in the field of refractive surgery. Begin to explore the Journal and all of its great benefits such as: • Columns including “Translational Science,” “Surgical Techniques,” and “Biomechanics” • Supplemental videos and materials available for many articles • Access to current articles, as well as several years of archived content • Articles posted online just 2 months after acceptance.