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  • Title: Irlen colored overlays do not alleviate reading difficulties.
    Author: Ritchie SJ, Della Sala S, McIntosh RD.
    Journal: Pediatrics; 2011 Oct; 128(4):e932-8. PubMed ID: 21930551.
    Abstract:
    OBJECTIVES: To test the efficacy of Irlen colored overlays for alleviating reading difficulties ostensibly caused by Irlen syndrome, a proposed perceptual disorder with controversial diagnostic status. PARTICIPANTS AND METHODS: Sixty-one schoolchildren (aged 7-12 years) with reading difficulties were assessed by an Irlen diagnostician. We used a within-subject study design to examine differences in reading rate across 3 conditions: using an overlay of a prescribed color; using an overlay of a nonprescribed color; and using no overlay. In a subset of 44 children, all of whom had a diagnosis of Irlen syndrome, we also used a between-group design to test the effects of Irlen colored overlays on a global reading measure. RESULTS: The Irlen diagnostician diagnosed Irlen syndrome in 77% of our poor readers. We found no evidence for any immediate benefit of Irlen colored overlays as measured by the reading-rate test or the global reading measure. CONCLUSIONS: Our data suggest that Irlen colored overlays do not have any demonstrable immediate effect on reading in children with reading difficulties.
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