Outcomes of Zero Power Intraocular Lenses: Insights into the Keratometric Index and Axial Length.

IF 2.6 3区 医学 Q2 OPHTHALMOLOGY
Ronald B Melles, David L Cooke, Thomas Olsen
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引用次数: 0

Abstract

Purpose: We analyzed intraocular lens (IOL) power calculation in a series of patients with a zero diopter power implant. The idea was to bypass the Estimated Lens Plane (ELP), an important variable in normal IOL calculation.

Setting: Large multi-center group practice.

Design: Retrospective, observational study.

Methods: A consecutive series of patients undergoing cataract surgery after optical biometry and implantation of a zero (0.0 D) power IOL were studied. Complete biometry was performed with an optical low coherence optical biometer. The predicted refraction was calculated with and without recalibrating the axial length (AL) using a Sum-Of-Segments (SOS) approach with the Hoffer Q, Holladay 1, SRK/T, Haigis, Barrett Universal II, and Olsen formulas. A ray tracing model to back-calculate the corneal power from the observed postoperative refraction and AL was also included.

Results: In 52 eyes of 52 patients, mean prediction errors for the Hoffer Q, Holladay 1, SRK/T, Haigis, Barrett Universal II, and the Olsen formulas were +1.48, +1.15, +0.91, +0.65, +0.15 and +0.11 D respectively using standard AL and after SOS correction of the AL the mean errors changed to +1.08, +0.75, +0.52, +0.26, -0.25, and -0.27 D respectively. The mean back-calculated corneal power was 1.25 D lower than the mean keratometer reading using the standard keratometric index of 1.3375 and corresponded to an effective index of 1.328.

Conclusions: The hyperopic error commonly seen in highly myopic eyes with classical thin-lens formulas is only partly corrected by SOS recalibration of the AL. We suggest the source of the residual error is an incorrect keratometric index.

零倍率人工晶状体的结果:对角膜测量指数和眼轴长度的认识。
目的:我们分析了一系列使用零屈光度人工晶状体的患者的人工晶状体(IOL)度数计算。这个想法是绕过估计晶状体平面(ELP),这是正常人工晶状体计算中的一个重要变量。设置:大型多中心小组练习。设计:回顾性观察性研究。方法:对连续接受白内障手术的患者进行光学生物测量和0 (0.0 D)次人工晶体植入术的研究。使用光学低相干光学生物计进行完整的生物测定。使用分段和(SOS)方法,使用Hoffer Q、Holladay 1、SRK/T、Haigis、Barrett Universal II和Olsen公式,在重新校准轴向长度(AL)和不重新校准轴向长度(AL)的情况下计算预测折射。通过观察术后屈光和AL反演角膜度数的光线追踪模型也包括在内。结果:52例患者的52只眼中,使用标准人工智能对Hoffer Q、Holladay 1、SRK/T、Haigis、Barrett Universal II和Olsen公式的平均预测误差分别为+1.48、+1.15、+0.91、+0.65、+0.15和+0.11 D,对人工智能进行SOS校正后的平均预测误差分别为+1.08、+0.75、+0.52、+0.26、-0.25和-0.27 D。平均后算角膜度数比标准角膜度数1.3375的平均角膜度数低1.25 D,对应的有效指数为1.328。结论:经典薄晶状体配方的高度近视眼常见的远视误差只能通过人工晶状体的SOS再校准部分矫正。我们认为残余误差的来源是不正确的角膜测量指数。
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
CiteScore
5.60
自引率
14.30%
发文量
259
审稿时长
8.5 weeks
期刊介绍: The Journal of Cataract & Refractive Surgery (JCRS), a preeminent peer-reviewed monthly ophthalmology publication, is the official journal of the American Society of Cataract and Refractive Surgery (ASCRS) and the European Society of Cataract and Refractive Surgeons (ESCRS). JCRS publishes high quality articles on all aspects of anterior segment surgery. In addition to original clinical studies, the journal features a consultation section, practical techniques, important cases, and reviews as well as basic science articles.
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