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Pattern-related visual stress, chromaticity, and accommodation

Allen, PM and Hussain, A and Usherwood, C and Wilkins, AJ (2010) 'Pattern-related visual stress, chromaticity, and accommodation.' Investigative Ophthalmology and Visual Science, 51 (12). 6843 - 6849. ISSN 0146-0404

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Abstract

PURPOSE. To investigate the impact of colored overlays on the accommodative response of individuals, with and without pattern- related visual stress (PRVS), a condition in which individuals manifest symptoms of perceptual distortion and discomfort when viewing a 3-cyc/deg square-wave grating. METHODS. Under double-masked conditions, 11 individuals who reported PRVS selected an overlay with a color individually chosen to reduce perceptual distortion of text and maximize comfort (PRVS group). Two groups of control subjects individually matched for age, sex, and refractive error were recruited. Control group 1 similarly chose an overlay to maximize comfort. Control group 2 used the same overlays as the paired PRVS participant. The overlay improved reading speed by 10% (P < 0.001), but only in the PRVS group. A remote eccentric photorefractor was used to record accommodative lag while participants viewed a cross on a background. The background was uniform or contained a grating and was either gray or had a chromaticity identical with that of the chosen overlay. There were therefore four backgrounds in all. RESULTS. Overall, the accommodative lag was 0.44 D greater in the participants with PRVS. When the background had the chosen chromaticity, the accommodative lag was reduced by an average of 0.16 D (P = 0.03) in the PRVS group, but not in the symptom-free groups: in control group 2 the colored background slightly increased the accommodative lag. CONCLUSIONS. Accommodative lag was greater in individuals susceptible to pattern-related visual stress and was reduced by a colored background. © Association for Research in Vision and Ophthalmology.

Item Type: Article
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RE Ophthalmology
Depositing User: Jim Jamieson
Date Deposited: 21 Nov 2011 14:02
Last Modified: 17 Aug 2017 18:15
URI: http://repository.essex.ac.uk/id/eprint/1543

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