Reports of benefit from colour came to the attention of Professor Arnold Wilkins of the Medical Research Council, UK in the early 1990's. Concerned that the benefit was placebo effect, he recognised that if colour potentially gave benefit, the colour needed to be selected with precision and with the three aspects of colour, hue, saturation and brightness independent of one another. To allow this selection he invented what is called today the Intuitive Colorimeter and used this instrument to carry out scientific research into this effect.

Following open trials, a double blind placebo controlled trial *2, published in 1994, proved that the beneficial effect of colour on perceptual distortion was not entirely attributable to a placebo effect. This meant that many children and adults with visual stress could be helped. Further research showed a possible explanation of the effect *3 and confirmed links with photosensitive epilepsy *4

Much research has also been carried out into the effect of colour with migraine.*5 Again people with migraine or with migraine in the family are particularly susceptible to the perceptual distortions seen in epileptogenic visual stimuli and colour can be of benefit.

It is recognised that problems of visual stress could be attributed to Binocular vision anomalies or refractive problems, so it is vitally important that prior to a colour assessment a full optometric examination is carried out to eliminate these possibilities which it would be inappropriate to treat with colour.*7 + *8