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Levels of Visual Stress in Proficient Readers: Effects of Spectral Filtering of Fluorescent Lighting on Reading Discomfort

Published online by Cambridge University Press:  10 August 2015

Stephen J. Loew*
Affiliation:
University of New England (Australia)
Celestino Rodríguez
Affiliation:
Universidad de Oviedo (Spain)
Nigel V. Marsh
Affiliation:
Sunway University (Malaysia)
Graham L. Jones
Affiliation:
University of New England (Australia)
Jose Carlos Núñez
Affiliation:
Universidad de Oviedo (Spain)
Kenneth Watson
Affiliation:
University of New England (Australia)
*
*Correspondence concerning this article should be addressed to Stephen Loew. School of Science & Technology. University of New England. Armidale (Australia). NSW 2351. Phone: +61–429845959. Fax: +61–249845959. Email: sloew@une.edu.au

Abstract

Visual stress (VS) affects reading in 5–12% of the general population and 31–36% of children with reading disorders. Symptoms include print distortions and visual discomfort when reading, and are exacerbated by fluorescent lighting. Prior research has indicated that VS can also affect proficient readers. We therefore examined levels of visual discomfort in a group of expert readers (n = 24) under both standard and spectrally-filtered fluorescent lighting. Participants rated their awareness of six symptoms of VS under each lighting condition. Under the standard condition, 4(16.7%) of the group recorded moderate to high levels of VS. Differences in symptom levels and reading speed between conditions were analysed using the Wilcoxon Signed Rank Test. Under the filter condition, the group reported less discomfort regarding all six symptoms of VS surveyed. The differences were significant with respect to three of the symptoms (p = .029 - p < .001), with a medium effect size in all of them (r = .31 - r = .46) and total score (p = .007; r = .39). Variations in reading proficiency included significantly fewer self-corrections (p = .019) and total errors (p = .004). Here we present evidence that VS-type symptoms of reading discomfort are not confined to populations with reading difficulties and may also occur in proficient readers, and that simple adaptations to fluorescent lighting may alleviate such symptoms.

Type
Research Article
Copyright
Copyright © Universidad Complutense de Madrid and Colegio Oficial de Psicólogos de Madrid 2015 

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