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Letters Treating reading difficulties with colour

Coloured filters may reduce symptoms of dyslexia in those with visual stress

BMJ 2014; 349 doi: (Published 30 September 2014) Cite this as: BMJ 2014;349:g5882
  1. Bruce J W Evans, director of research1,
  2. Peter M Allen, professor of optometry and visual science2
  1. 1Institute of Optometry, London SE1 6DS, UK
  2. 2Department of Vision and Hearing Sciences and Vision and Eye Research Unit, Anglia Ruskin University, Cambridge CB1 1PT, UK
  1. admin{at}

Henderson and colleagues did not consider one obvious explanation for the endorsement of coloured filters by dyslexia charities: these charities are in close contact with their members, some of whom provide feedback on benefits from coloured filters.1 Coloured filters are not a treatment for dyslexia but reduce symptoms in individuals with visual stress,2 which affects only about one third of people with dyslexia.3 4 Consequently, studies that ask whether coloured …

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