Coloured filters improve exclusion of perceptual noise in visually symptomatic dyslexics

Nadia Northway, Velitchko Manahilov, William Simpson

Research output: Contribution to journalArticle


Previous studies of visually symptomatic dyslexics have found that their contrast thresholds for pattern discrimination are the same as non-dyslexics. However, when noise is added to the stimuli, contrast thresholds rise markedly in dyslexics compared with non-dyslexics. This result could be due to impaired noise exclusion in dyslexics. Some dyslexics report a reduction in discomfort experienced while reading and show increased reading speed when using coloured lenses. We hypothesised that coloured lenses work by aiding noise exclusion. Thus the coloured lenses should help performance best under conditions of high visual noise.

Original languageEnglish
Pages (from-to)223-230
Number of pages8
JournalJournal of Research in Reading
Issue number3
Publication statusPublished - 1 Aug 2010



  • dyslexia
  • visual noise
  • vision sciences

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