Spherical subjective refraction with a novel 3D virtual reality based system
Pujol Ramo, Jaume (Davalor Research Center)
Ondategui-Parra, Juan Carlos (Davalor Research Center)
Badiella Busquets, Llorenç (Universitat Autònoma de Barcelona. Servei d'Estadística Aplicada)
Otero, Carles (Davalor Research Center)
Vilaseca, Meritxell (Davalor Research Center)
Aldaba, Mikel (Davalor Research Center)

Date:	2016
Abstract:	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. For 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. With 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. The 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.
Grants:	Ministerio de Economía y Competitividad MTM2012-31118 Ministerio de Economía y Competitividad DPI2011-30090-C02-01
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Subjective refraction ; Autorefractor ; Precision ; Agreement ; Virtual reality ; Refracción subjetiva ; Precisión ; Concordancia ; Realidad virtual
Published in:	Journal of optometry, Vol. 10, issue 1 (Jan.-March 2017) , p. 43-51, ISSN 1989-1342

DOI: 10.1016/j.optom.2015.12.005
PMID: 26856962

9 p, 1.4 MB

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