Spherical subjective refraction with a novel 3D virtual reality based system

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• 作者：Jaume Pujol^a ; Juan Carlos Ondategui-Parra^a ; Llorenç ; Badiella^b ; Carles Otero^a ; ^{carles.otero.molins@cd6.upc.edu} ; Meritxell Vilaseca^a ; Mikel Aldaba^a
• 关键词：Subjective refraction ; Autorefractor ; Precision ; Agreement ; Virtual reality
• 刊名：Journal of Optometry
• 出版年：2017
• 出版时间：January-March 2017
• 年：2017
• 卷：10
• 期：1
• 页码：43-51
• 全文大小：1399 K
• 卷排序：10

文摘

To conduct a clinical validation of a virtual reality-based experimental system that is able to assess the spherical subjective refraction simplifying the methodology of ocular refraction.MethodsFor the agreement assessment, spherical refraction measurements were obtained from 104 eyes of 52 subjects using three different methods: subjectively with the experimental prototype (Subj.E) and the classical subjective refraction (Subj.C); and objectively with the WAM-5500 autorefractor (WAM). To evaluate precision (intra- and inter-observer variability) of each refractive tool independently, 26 eyes were measured in four occasions.ResultsWith regard to agreement, the mean difference (±SD) for the spherical equivalent (M) between the new experimental subjective method (Subj.E) and the classical subjective refraction (Subj.C) was −0.034 D (±0.454 D). The corresponding 95% Limits of Agreement (LoA) were (−0.856 D, 0.924 D). In relation to precision, intra-observer mean difference for the M component was 0.034 ± 0.195 D for the Subj.C, 0.015 ± 0.177 D for the WAM and 0.072 ± 0.197 D for the Subj.E. Inter-observer variability showed worse precision values, although still clinically valid (below 0.25 D) in all instruments.ConclusionsThe spherical equivalent obtained with the new experimental system was precise and in good agreement with the classical subjective routine. The algorithm implemented in this new system and its optical configuration has been shown to be a first valid step for spherical error correction in a semiautomated way.