Neuro-Ophthalmology & Visual Neuroscience
ISSN (Print): 2572-7257 ISSN (Online): 2572-7281 Website: Editor-in-chief: Carlo Aleci
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Neuro-Ophthalmology & Visual Neuroscience. 2015, 1(1), 18-21
DOI: 10.12691/novn-1-1-4
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Colored Filters and Dyslexia. A Quick Gliding over Myth and (Possible) Reality

Carlo Aleci1, 2,

1Department of Ophthalmology, The Gradenigo Hospital, Turin, Italy

2Neuro-ophthalmology Center, Department of Ophthalmology, University of Turin, Italy

Pub. Date: December 31, 2014

Cite this paper:
Carlo Aleci. Colored Filters and Dyslexia. A Quick Gliding over Myth and (Possible) Reality. Neuro-Ophthalmology & Visual Neuroscience. 2015; 1(1):18-21. doi: 10.12691/novn-1-1-4


Since the early Eighties, a great deal of literature is debating the rehabilitative role of colored filters in developmental dyslexia. It has been advocated that the use of the so-called “intuitive overlays” and of individually chosen colors can be beneficial in disabled readers, improving reading rate and/or comprehension. However, in absence of a sound theory accounting for the individual preferences in color, such approach lacks scientificity and its putative effectiveness is likely to depend on placebo effect. Notwithstanding, it has been shown that the magnocellular pathway, whose abnormal inhibition is believed to be responsible for part of the reading impairment in dislexics, can be sensitive (and as such modulated) by certain light wavelength. In particular long wavelengths (red light) would have a suppressive effect whereas short wavelengths (blue light) would enhance its function. Based on this rationale, research on colored filters and its applicability on reading disabilities might provide a promising rehabilitative approach.

dyslexia colored filters magnocellular wavelengths

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[1]  Wilkins, A.J., Nimmo-Smith, I., Tait, A., McManus, C., Della Sala, S., Tilley, A., Arnold, K., Barrie, M. and Scott, S, “A neurological basis for visual discomfort,” Brain, 107. 989-1017. 1984.
[2]  Huang, J., Cooper, T.G., Satana, B., Kaufman, D.I, and Cao, Y, “Visual distortion provoked by a stimulus in migraine associated with hyperneuronal activity,” Headache, 43. 664-671. 2003.
[3]  Wilkins, A.J., Baker, A., Amin, D., Smith, S., Bradford, J., Zaiwalla, Z., Besag, F.M., Binnie, C.D., Fish, D, “Treatment of photosensitive epilepsy using coloured glasses,” Seizure, 8.444-449. 1999.
[4]  Singleton, C. and Trotter, S, “Visual stress in adults with and without dyslexia,” Journal of Research in Reading, 28. 365-378. 2005.
[5]  Irlen, H, “Successful treatment of learning disabilities,” in 91st Annual Convention of the American Psychologists Association, August 1983; Anaheim, California. 1983.
[6]  Irlen, H, “Improving reading problems due to symptoms of scotopic sensitivity syndrome using Irlen lenses and overlays,” Education, 109. 413-417. 1989.
[7]  Irlen, H, Reading by colours, Avery Publishing Group Publisher, New York, 1991.
[8]  Irlen, H, “Reading problems and Irlen coloured lenses,” Dyslexia Review, 4-7. 1997.
[9]  Wilkins, A.J, “Overlays for classroom and optometric use,” Ophthalmic and Physiological Optics. 14. 97-99. 1994.
[10]  Kriss,, L. and Evans, B.J.W, “The relationship between dyslexia and Meares-Irlen Syndrome,” Journal of Research in Reading, 28: 350-364. 2005.
[11]  Parker, R.M, “Power, control, and validity in research,” Journal of Learning Disabilities, 23. 613-620. 1990.
[12]  Evans, B.J.W. and Drasdo, N, “Tinted lenses and related therapies for learning disabilities: a review,” Ophthalmic and Physiological Optics, 11. 206-217. 1991.
[13]  Christenson, G.N., Griffin, J.R., Taylor, M, “Failure of blue tinted lenses to change reading scores of dyslexic individuals”, Optometry, 72. 627-633. 2001.
[14]  Bouldoukian, J., Wilkins, A.J. and Evans, B.J.W, (2002). “Randomised controlled trial of the effect of coloured overlays on the rate of reading of people with specific learning difficulties,” Ophthalmic and Physiological Optics, 22. 55-60. 2002.
[15]  Ritchie, S.J., Della Sala, S. and McIntosh, R.D. “Irlen colored overlays do not alleviate reading difficulties,” Pediatrics, 128. e932-938. 2011.
[16]  Ritchie, S.J., Della Sala, S. and McIntosh, R.D, “Irlen colored filters in the classroom: a 1-Year Follow-Up,” Mind,. Brain, and Education. 6, 74-80. 2012.
[17]  Palomo-Ὰlvarez, C. and Puell, M.C, “Effects of wearing yellow spectacles on visual skills, reading speed, and visual symptoms in children with reading difficulties,” Graefe’s Archive for Clinical and Experimental Opthalmology, 251. 945-951. 2013.
[18]  Henderson, L.M., Tsogka, N.and Snowling, M.J, “Questioning the benefits that coloured overlays can have for reading in students with and without dyslexia,” Jorsen, 13. 57-65. 2013.
[19]  Robinson, G.L., Foreman, P.J, “Scotopic sensitivity/Irlen syndrome and the use of coloured filters: a long term placebo controlled study of reading strategies using miscue analysis”, Perceptual & Motor Skills, 88. 35, 52. 1999.
[20]  Robinson, G.L., Foreman, P.J, “Scotopic sensitivity/Irlen syndrome and the use of coloured filters: a long term placebo controlled and masked study of reading achievement and perception of ability”, Perceptual & Motor Skills, 89. 83-113. 1999.
[21]  Breitmeyer, B.G, “Unmasking visual masking: a look at the “why” behind the veil of the “how”,” Psychology Review, 87. 52-69. 1980.
[22]  Chase, C.H, (1996). A visual deficit model of developmental dyslexia. In Chase CH, Rosen GD, Developmental dyslexia: neural, cognitive, and genetic mechanisms, Timonium, MD. Sherman GF Publisher, York Press, 2013.
[23]  Chase, C., Ashourzadeh, A., Kelly, C., Monfette, S. and Kinsey, K, “Can the magnocellular pathway read? Evidence from studies of color,” Vision Research, 43. 1211-1222. 2003.
[24]  Legge, G.E, “Sustained and transient mechanisms in human vision: temporal and spatial properties,” Vision Research, 18. 69-81. 1978.
[25]  Aleci, C. Dyslexia: A Visual Approach. NovaScience Publisher, New York, 2013.
[26]  Svaetichin, G, “Spectral response curves for single cones,” Acta Physiologica Scandinavica, 39 suppl.134. 17-46. 1956.
[27]  Livingstone, M., Hubel, D, “Segregation of Form, Color, Movement, and Depth: Anatomy, Physiology, and Perception,” Science, 240. 740-749. 1988.
[28]  Wiesel, T.N. and Hubel DH, “Spatial and chromatic interactions in the lateral geniculate body of the rhesus monkey,” Journal of Neuropsychology, 29. 1115-1156. 1966.
[29]  Dreher, B., Fukuda, Y. and Rodieck, R.W, “Identification, classification and anatomical segregation of cells with X-like and Y-like properties in the lateral geniculate nucleus of old-world primates,” Journal of Physiology, 258. 433-452. 1976.
[30]  Kruger, J, “Stimulus dependent colour specificity of monkey lateral geniculate neurons,” Experimental Brain Research, 30. 297-311. 1977.
[31]  Schiller, P. and Malpeli, J, “Functional specificity of lateral geniculate nucleus laminae of the rhesus monkey,” Journal of Neurophysiology, 41. 788-797. 1978.
[32]  Breitmeyer, B.G. and Williams, M.C, “Effect of isoluminant-background color on metacontrast and stroboscopic motion: interaction between sustained (P) and transient (M) channels,” Vision Research, 30. 1069-1075. 1990.
[33]  Pammer, K and Lovergrove, W, “The influence of color on transient system activity: implication for dyslexia research,” Perception & Psychophysics, 63. 490-500. 2001.
[34]  Edwards, V.T., Hogben, J.H., Clark, C.D. and Pratt. C,“Effects of a red background on magnocellular functioning in average and specifically disabled readers,” Vision Research, 36. 1037-1045. 1996.
[35]  Breitmeyer, B.G. and Breier, J.I, “Effects of background color on reaction time to stimuli varying in size and contrast: inferences about human M channels”, Vision Research, 34. 1039-1045. 1994.
[36]  Stromeyer, C.F., Chaparro, A., Tolias, A.S. and Kronauer, RE, "Color adaptation modifies the long-wave versus middle-wave cone weights and temporal phases in human luminance (but not red-green) mechanism,” Journal of Physiology, 499. 227-254. 1997.
[37]  Williams, M.C., Breitmeyer, B.G., Lovergrove, W.J., Gutierrez, C, “Metacontrast with masks varying in spatial frequency and wavelength”, Vision Research, 31. 2017-2023. 1991.
[38]  Hall, R., Ray, N., Harries, P and Stein, J, “A comparison of two-coloured filter systems for treating visual reading difficulties,” Disability and Rehabilitation, 35. 2221-2226. 2013.
[39]  Stein, J.F, “Visual motion sensitivity and reading,” Neuropsychologia, 41. 1785-1793. 2003.
[40]  Williams, M.C., LeCluyse, K and Bologna, N, “Masking by light as a measure of visual integration time in normal and disabled readers,” Clinical Vision Sciences, 5. 335-343. 1990.
[41]  Iovino, I., Fletcher, J.M., Breitmeyer, B.G. and Foorman, B.R, “Colored overlays for visual perceptual deficits in children with reading disability and attention defict/hyperactivity disorders: are they differentially effective?,” Journal of Clinical and Experimental Neuropsychology, 20(6). 791-806. 1998.
[42]  Solan, H.A. and Richman, J, “Irlen Lenses: a critical appraisal,” Journal of the American Optometric Association, 61. 789-796. 1990.
[43]  Helveston, E.M, “Scotopic sensitivity syndrome,” Archives of Ophthalmology, 108: 1232-1233. 1990.
[44]  Coyle, B, “Use of filters to treat visual-perception problem creates adherents and skeptics,” Canadian Medical Association Journal, 152. 749-750. 1995.
[45]  Wilkins, A., Sihra, N. and Smith, I.N, “Technical Note: How do precision tints have to be and how many are necessary?,” Ophthalmic and Physiological Optics, 25. 269. 2005.