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Blue light therapy has also been shown to help people with sleeping problems, to improve alertness during night shift work and to help overcome jet lag. This probably also works on the suprachiasmatic nucleus to alter the timing of diurnal rhythms. We found that children whose reading benefitted from wearing blue filters during the day also often reported that their sleeping patterns had improved, and we showed that this was probably due to an effect on the SCN; at night secretion of the sleep hormone, melatonin, which is also under the control of the SCN, can be inhibited by just 15 minutes of blue light ie blue light can reset the SCN rhythms to improve sleeping. Contrary to the coloured lenses research that was conducted in 1999, coloured overlays can be looked upon as controversial. This is because, in an experiment conducted where some participants were asked to read text without an overlay and then with an overlay, there was no significant difference between the reading speeds for either method. For example, Emily, aged 7 when the experiment took place, had a reading speed of 49 correct words per minute (CWPM) without an overlay and 48 CWPM with the overlay. The overlays being referred to as dyslexia overlays can also be considered controversial because they do not only help people with dyslexia, but they can also be beneficial for people with dyspraxia and AD(H)D. What Colour Overlay is Best for Dyslexia? Please note the colours shown in the pictures may not be an exact representation of the colour in real life. Irlen: Irlen lenses, also known as Irlen Spectral Filters, are coloured overlays or lenses that aim to reduce perceptual distortions and visual stress experienced by some people with dyslexia. The specific colours are customised for each individual based on their symptoms.
There are different types of colour filters that can aid reading for people with dyslexia. Find out all about dyslexic glasses and overlays here. How do Tinted Glasses and Lenses Work? Essilor: Essilor is a well-known eyewear company that offers a range of lenses, including those designed for dyslexia. They have developed specific lens technologies, such as Eyezen lenses, which are designed to reduce visual fatigue and improve comfort during prolonged reading or computer use.Bright blue light can also improve auditory attention, suggesting that the effects of light on alertness and attention are automatic and not mediated by conscious visual perception. Rather they are mediated by this retino-hypothalamic synchronising system. But disagreement among researchers still exists over the mechanisms and theory behind the filters’ effects. And debate still rages surrounding the fundamental issue of which colour is needed to achieve optimal results. Myth versus evidence
Symptoms such as these have a variety of different causes, some of which may be due to disease or abnormality, so they must be investigated by a professional who is qualified to diagnose them correctly and give appropriate treatment. Anyone who experiences such difficulties associated with reading should consult a registered optometrist for a full assessment of eye health and visual function.That being said, here are a few popular brands and technologies that are commonly associated with dyslexia glasses and lenses: Blue filters can be even more effective. Joe Taylor showed that they probably work in a different way; because blue can affect the brain unconsciously. From the grainy two-dimensional images that are projected onto our retinae, and projected to the visual cortex via the retino-geniculate pathway, the brain creates a conscious vivid and detailed three-dimensional visual experience. But blue projects to other important pathways running from the eyes deep into a primitive part of the brain called the hypothalamus; this controls powerful physiological systems that regulate our diurnal rhythms: when we wake up, the daily rise and fall of our blood pressure, energy and hormone levels, that we are hardly aware of. Melanopsin retinal ganglion cells and their projections (melanopsin RGCs) Proponents of this theory say that prescribed coloured eyeglasses or plastic overlays could alleviate perceived visual distortions. It is believed that the removal of this visual stress would improve reading and facilitate the development of reading skills in the longer term and help people with dyslexia. The simplicity of the intervention has helped it to become embedded into the practice of teachers, educational psychologists, optometrists and NHS orthoptic departments across the UK. One side of the overlay has a matt coating. Some matt coatings can reduce transparency, but coloured overlays from Crossbow Education have been subjected to stringent testing to ensure that maximum print clarity is retained while reflected light from the overlay surface has been significantly reduced. Nevertheless, some people prefer using the gloss side of the overlay.
Our 10 scientifically selected colours; can be combined to make 30 tints equally around the colour spectrum The DRT has carried out a randomised control trial that showed that in suitable dyslexic children, wearing blue filters for 3 months improved their reading age by an amazing 9 months. Some people experience visual discomfort or disturbance when they read. Common symptoms that may significantly impair reading ability, or make reading very tiring, include: Research has demonstrated that people with dyslexia often have difficulty processing and representing the specific sounds of language. As a result, someone with dyslexia will experience difficulties in associating printed letters with relevant speech sounds, thus causing reading difficulties.Likewise we found that in these dyslexics, who often complain of migraine type headaches, the blue filters often improved their headaches. Migraine was previously thought to be due to swelling of the arteries in the membranes surrounding the brain, the meninges. But we now believe that the hypothalamus and specifically the SCN is responsible. Blue coloured filters, worn as spectacles, have been found to be highly effective in reducing the frequency of migraine symptoms. So our blue filters are also often efficacious in reducing migraine. The children tend to lose their self-confidence. Because literacy is so important in the modern world, they often face a life of failure and depression. Or their anger and frustration with the world may lead them into aggression and crime. Yet if they survive their schooling, many dyslexics can become remarkably successful. Coloured Filters Olive Meares in Australia was the first to suggest that children with visual reading difficulties may see print more easily through certain coloured filters. This was taken up commercially in the USA and UK. But these systems require that each child is individually prescribed a special colour; so the glasses tend to cost a lot! However since the visual magnocellular system is mainly influenced by just yellow or blue light, John & Sue argue that these are the only two colours that will really make much difference.
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