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David Harris, D.A.

Following his baccalaureate studies in Applied Optics, graduate studies in Advanced Contact Lens Practice, and doctoral studies in Neurological Implications & Assistance for Reading Disability, Dr. David Harris dedicated twenty-five years to perfecting the ChromaGen® system of testing methodologies and prescriptive filters.


After working in various areas of optometric practice and co-founding a practice in 1987, Dr. Harris entered the field of refractive surgery where he joined The Corneal Laser Centre. His research to develop ChromaGen filters began in the late ‘80s when he began testing patients who were color deficient. The initial filters were first prescribed as contact lenses—although a form of spectacles was eventually developed. In 1987, results of his first trials were published.

"Optician Colouring Sight: A Study of CL Fittings with Colour Enhancing Lenses" UK Optician Journal August 6, 1997. Print.

It was determined that Harris’s lenses helped dyslexics as well, but in-order to confirm this hypothesis a pilot study was carried out at Clatterbridge Hospital in Wirral, England. The results of the Claterbridge study were then published.

"Interim report on the use of ChromaGen contact lenses in patients with specific learning difficulties – a comparative study with the Intuitive Colorimeter." Optometry Today 1998. Print.

In 1998, research to investigate a possible application of ChromaGen for dyslexics was launched. Significant improvements in reading speed, in comparison to a control group, were observed—thus proving that the effectiveness of ChromaGen filters was not merely a placebo effect.

Dr. Harris was appointed Research Director of The Corneal Laser Centre in 1999 and continued working with ChromaGen while carrying out clinical work for refractive surgery patients within the clinic. Also in 1999, a randomized, double-blind, placebo-controlled trial was carried out at Clatterbridge Hospital and published in the US journal of the AOA.

"Application of ChromaGen haploscopic lenses to patients with dyslexia: a double-masked placebo controlled trial" Journal of the American Optometric Association October 25, 1999. Print.