Fluorescent lights are everywhere — in schools, hospitals, grocery stores, the shopping mall, and now, more than ever, they are also in our homes. With recent initiatives to increase energy efficiency, individuals are regularly swapping out their incandescent light bulbs for fluorescent bulbs in their bedside table lamps and kitchen pendant lights. The result is simply a lower energy bill for most, but for the 37 million Americans who are light sensitive, this small change can add to the constant stress their brains are under as a result of bright and fluorescent lighting.

Since 1980, research has repeatedly documented the presence of, and difficulties associated with, a little known disorder known as Irlen syndrome. Irlen syndrome is a perceptual processing disorder affecting 12-14% of the general population and characterized by a variety of physical symptoms exacerbated by bright lighting (bright lights, fluorescent, computer screens, iPhone, white paper, white boards) and visually intensive activities.

Three decades worth of psychological and educational research has documented the difficulties individuals with Irlen syndrome experience, including issues with print clarity and stability, headaches, migraines, nausea, depth perception, and fatigue. But only recent research utilizing advanced brain mapping technology has revealed exactly what the brain looks like when individuals with Irlen syndrome are exposed to bright lighting and tasked with visually intensive activities. Researchers have utilized functional magnetic resonance imaging (fMRI), visual evoked responses (VER), and single photon emission computed tomography (SPECT) scans to objectively document the profound effects of sensory overload on the brain. In one study by Amen and colleagues, comparing the brains of 42 people with Irlen syndrome to 200 age-matched individuals without any evidence of Irlen syndrome, SPECT showed increased activity in the brain’s emotional and visual processing centers and decreased activity in the cerebellum (an area that helps to integrate coordination and new information).

For these individuals, lighting and glare, high contrast (black print on white paper), and visually intensive activities create high levels of stress for a brain that is unable to correctly process the visual information being sent to it. Fluorescent lights are exceptionally troublesome for individuals with Irlen Syndrome and tend to trigger and exacerbate symptoms, including headaches and migraines. Their brains have difficulty processing specific wavelengths of light, and the offensive wavelengths of light create stress for the brain, resulting in over-activity, complex brain patterns, and non-normalized functioning. This results in a variety of issues, including difficulties reading because letters and words blur or move on the page; issues with glare or discomfort from the white background on the printed page; physical symptoms, such as headaches, migraines, nausea, eye-strain and fatigue; and depth perception issues. In addition, when the brain is under constant stress from lighting conditions and the environment, it can impact functioning of the entire nervous system, resulting in not just physical symptoms like headaches and migraines, but also impacting the auto-immune system, allergies, sleep patterns and overall energy levels.

Color Can Ease the Pain and Normalize the Brain

For those with Irlen syndrome, it is possible to remove the stress on the brain by using colored spectral filters (worn as glasses). The correct color will filter out the specific wavelength(s) of light to which the individual is sensitive. This modifies the speed at which visual information reaches the brain and allows the brain to correctly process the information, eliminating physical discomfort and distortion on the printed page and in the environment. SPECT scans show that when an individual with Irlen syndrome is wearing the correct color, most of the hotspots showing overactive brain activity disappear. This translates to a calm brain, elimination of headaches, migraines and other physical discomfort, and increased ability to process visual information.

The important thing to remember is that most people don’t have any problem with fluorescent lighting — it does not give them headaches, it does not make it harder for them to read, it does not affect how their brains function. However, for those who make up the estimated 37 million Americans who are light sensitive, fluorescent lighting can have a dramatic effect on the brain and the individual’s ability to process visual information successfully and pain-free. Color can alleviate light sensitivity and related difficulties and discomfort for many.

References

Chronicle EP, & Wilkins AJ (1991). Colour and visual discomfort in migraineurs. Lancet, 338 (8771) PMID: 1681246

Huang, J., Zong, X., Wilkins, A., Jenkins, B., Bozoki, A., & Cao, Y. (2011). fMRI evidence that precision ophthalmic tints reduce cortical hyperactivation in migraine Cephalalgia, 31 (8), 925-936 DOI: 10.1177/0333102411409076

Irlen, H. (2010). The Irlen Revolution: A Guide to Changing Your Perception and Your Life. New York: SquareOne Publishers.

Kruk R, Sumbler K, & Willows D (2008). Visual processing characteristics of children with Meares-Irlen syndrome. Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists), 28 (1), 35-46 PMID: 18201334

Lewine, J.D. (1999). Changes in visual evoked magnetic field for people with Scotopic Sensitivity/Irlen Syndrome. Newcastle, Australia: Fourth Biannual Australasian Irlen Conference, May 20-22.

Riddell PM, Wilkins A, & Hainline L (2006). The effect of colored lenses on the visual evoked response in children with visual stress. Optometry and vision science : official publication of the American Academy of Optometry, 83 (5), 299-305 PMID: 16699442

Robinson, G.L. (1994). Coloured lenses and reading: a review of research into reading achievement, reading strategies and causal mechanisms. Australian Journal of Special Education, 18, 3-14.

Robinson GL, McGregor NR, Roberts TK, Dunstan RH, & Butt H (2001). A biochemical analysis of people with chronic fatigue who have Irlen Syndrome: speculation concerning immune system dysfunction. Perceptual and motor skills, 93 (2), 486-504 PMID: 11769907

Williams, M., Littell, R., Reinoso, C., & Greve, K. (1994). Effect of wavelength on performance of attention-disordered and normal children on the Wisconsin Card Sorting Test. Neuropsychology, 8 (2), 187-186 DOI: 10.1037/0894-4105.8.2.187

Wilkins, A.J., & Clark, C. (1990). Modulation of lighting from fluorescent lights. Lighting and Research Technology, 22, 103-109.

Yellen, A. (2010). Irlen syndrome: a case study. Los Angeles Psychologist, May-June, 16-18.

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