a technique that used the Intuitive Colorimeter, developed under Medical Research Council license. An alternative approach to correct Irlen syndrome was tried by Orthoscopics franchise in the UK, with wide color coverage and tints manufactured by Hoyato match. Other commercial organizations have produced sets of therapeutic tints, although most have not received scientific evaluation. Early studies investigating Irlen' Syndrome as a treatable condition have been criticized for having a biased and subjective approach to their research; however, the most current research on Irlen Syndrome has established a hereditary component of the disorder, a number of biochemical markers for problems associated with Irlen Syndrome, and differences in brain function for individuals with Irlen Syndrome. Classifications Irlen divides Irlen syndromes into six types: photophobia, distortion of the fundus, graphical distortions during reading, decreased visual field, difficulty in ocular fixation during reading and change in depth perception. Research There is currently a body of research related to Irlen Syndrome, Colored Overlays and Colored Filters that spans nearly 40 years. The Irlen Method and the efficacy of colored overlays and colored lenses has been the subject of over 200 research studies encompassing the disciplines of education, psychology, and medicine. To date, more than 100 of these studies supporting the use of colored overlays and lenses to treat the perceptual processing difficulties associated with Irlen Syndrome are published in peer-reviewed academic and scientific journals, including the Journal of Learning Disabilities, Australian Journal of Special Education, Perceptual and Motor Skills, Australian Journal of Learning Disabilities, Journal of Clinical & Experimental Neuropsychology, Journal of Research in Reading, Behavioral Optometry, and Ophthalmological and Behavioral Optics, among others. The condition has been studied in several institutions around the world, including Cornell University, University of Pittsburgh in the United States, the Psychology Department at Essex University, and the former Applied Psychology Unit, Cambridge University in England, David Yellen Academic College in Israel, the University of Tsukuba and Chiba University in Japan, Universidade Federal de Minas Gerais and Faculdades Integradeas Pitagoras de Montes Claros in Brazil, and Glasgow Caledonian University in Scotland. In Australia, Irlen syndrome was researched by Paul Whiting at the University of Sydney. Whiting set up the first Irlen Dyslexia Centre in Australia, which operated in the Children's Centre at Sydney University for more than 15 years. Irlen syndrome was also studied in Australia by Greg Robinson (1944–2008) at the University of Newcastle. He was director of the