The eye sends "images" to the brain using complex processes. Light entering the eye is converted in the retina at the back of the eye into signals which then pass along the optic nerve into the brain, where they enter the visual cortex. Exactly how these processes take place is only partially understood and is the subject of continuing international research.
How Colour Works to Alleviate the Symptoms of Visual Stress
Visual stress is due to hyperexcitability of neurones in the visual cortex. This means that some of the cells in the visual pathways to the brain which deal with processing visual information work too fast and do not respond in the way they should.
We know that certain cells in the visual cortex are colour sensitive and therefore by placing a colour in front of the eye the pattern of excitation can be changed. In other words the colour will help to slow and calm these cells and therefore quieten the pattern of the text and reduce the visual stress.
Colour is needed to reduce the hyperexcitability and the colour prescribed using the Orthoscopics system is very precise and specific to each person. This precise colour is then transposed into tinted glasses.
To understand more about visual issues, the following may be of interest:
Visual Aspects of Dyslexia,
John Stein and Zoi Kapoula, 2012
The Light Barrier: A Color Solution to Your Child’s Light-based Reading Difficulties,Rhonda Stone, 2002
Reading Through Colour
by Arnold Wilkins, 2003
Dyslexia and Vision
by Bruce Evans, 2001