Vecto-keratometry: determination of anterior corneal astigmatism in manual keratometers using power vectors.

IF 2.9 3区医学 Q3 ENGINEERING, BIOMEDICAL

Expert Review of Medical Devices Pub Date : 2023-06-01 DOI:10.1080/17434440.2023.2206019

Raquel Salvador-Roger, Rosa Vila-Andrés, Vicente Micó, José J Esteve-Taboada

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引用次数: 0

Abstract

Background: A new keratometric routine that employs power vector management for manual keratometers is described. This study evaluates the agreement of the new proposed keratometric technique with the classical one.

Research design and methods: The applicability of a new keratometric routine was verified using Helmholtz's and Javal's keratometers. Results were obtained by two different and well-trained examiners over two different samples, one including 65 and the other 74 eyes, respectively. Both conventional keratometry and the newly proposed routine (named vecto-keratometry) were used in each eye to obtain the results. The clinical agreement between the methods was evaluated using Bland-Altman and Passing-Bablok analysis.

Results: For Helmholtz's keratometer, Bland-Altman plots showed good agreement between methods for both astigmatic components being J₀ = 0.04 ± 0.20 D and J₄₅ = -0.07 ± 0.17 D. For Javal's keratometer, Passing-Bablok regression test determined regression line for J₀ difference as y₀ = 1.03, confidence interval: [0.98, 1.10] and regression line for J₄₅ difference as y₄₅ = 0.97, confidence interval: [0.83, 1.12].

Conclusions: Vecto-keratometry provides accurate clinical results. It has been demonstrated that there are no significant differences between methods in any of the power vector astigmatic components; thus, both methods can be applied interchangeably.

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矢量角膜屈光度法:用功率矢量测定人工角膜屈光度仪中的前角膜散光。

背景:介绍了一种采用功率矢量管理的人工角膜测量新方法。本研究评估了新提出的角膜测量技术与经典技术的一致性。研究设计与方法:采用Helmholtz和Javal角膜计验证了一种新的角膜测量程序的适用性。结果是由两个不同的、训练有素的检查员对两个不同的样本得出的，一个包括65只眼睛，另一个包括74只眼睛。在每只眼睛中使用常规角膜测量和新提出的常规(称为矢量角膜测量)来获得结果。采用Bland-Altman和Passing-Bablok分析评估两种方法的临床一致性。结果:对于Helmholtz的角度计，Bland-Altman图显示，J0 = 0.04±0.20 D和J45 = -0.07±0.17 D两个散像分量的方法吻合良好。对于Javal的角度计，Passing-Bablok回归检验确定J0差的回归线为y0 = 1.03，置信区间为[0.98,1.10]，J45差的回归线为y45 = 0.97，置信区间为[0.83,1.12]。结论:角膜测定仪能提供准确的临床结果。已经证明，在任何功率矢量像散分量的方法之间没有显着差异;因此，这两种方法可以互换应用。

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

Expert Review of Medical Devices 医学-工程：生物医学

CiteScore

5.90

自引率

3.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal serves the device research community by providing a comprehensive body of high-quality information from leading experts, all subject to rigorous peer review. The Expert Review format is specially structured to optimize the value of the information to reader. Comprehensive coverage by each author in a key area of research or clinical practice is augmented by the following sections: Expert commentary - a personal view on the most effective or promising strategies Five-year view - a clear perspective of future prospects within a realistic timescale Key issues - an executive summary cutting to the author''s most critical points In addition to the Review program, each issue also features Medical Device Profiles - objective assessments of specific devices in development or clinical use to help inform clinical practice. There are also Perspectives - overviews highlighting areas of current debate and controversy, together with reports from the conference scene and invited Editorials.