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  • Title: Coloured filters and reading accuracy, comprehension and rate: a placebo-controlled study.
    Author: Mitchell C, Mansfield D, Rautenbach S.
    Journal: Percept Mot Skills; 2008 Apr; 106(2):517-32. PubMed ID: 18556906.
    Abstract:
    Literature suggests that visuoperceptual deficits not normally assessed by eye examinations may be responsible for certain reading disabilities. Previous studies indicate that the use of nonoptical coloured filters may reduce these deficits and improve reading performance. Present research involved 49 participants with visuo-perceptual reading disabilities. Participants were divided into a control group who received no intervention, a placebo group who received filters in a colour complementary to the individual's optimal colour, and an experimental group who received specifically matched coloured filters. At posttest the experimental group reported statistically significantly fewer visual discomfort symptoms. The remainder of the results were, however, inconsistent. Some potential explanations are explored.
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