Effects of specific colours

Research has also shown that colour-tinted spectacles can be highly effective in the treatment of learning difficulties, notably dyslexia. This was first discovered by American psychologist Helen Irlen, but was regarded sceptically until investigations by the British Medical Research Council confirmed Irlen's claims. In 1993 a new optician's device called the Intuitive Colorimeter was made available to British opticians so they could measure which tint - bright pink, yellow, green or blue - best helps people who normally see text as swirling, wobbling or with letters appearing in the wrong order.