Displaying items by tag: Dyslexia

ChromaGen for Dyslexia, ASD and Colour Deficiency

ChromaGen™ is a unique product that was developed to help patients who suffer from either colour deficiency or academic skills disorder (ASD™) including Dyslexia.

The Treatment

To assess a patient for either colour deficiency or ASD™, the ChromaGen™ Diagnostic System is required. It comprises a full range of diagnostic filters and a 25 contact lens trial set in the same colours as the filters.

This offers a choice of density of colour and of tint diameter (5mm, 6mm & 7mm) to ensure optimum performance from the chosen hue.

Patients selecting ChromaGen™ Haploscopic Filters have an option of either individually prescribed contact lenses or filters. In contact lens format the lenses are made from Benz G-5X, 55% Hioxifilicon 4A, a very high quality bio-compatible material that offers greater comfort and wearing times than other materials. The lenses are available in 14.50 mm diameter, standard 8.60 mm radius (8.30mm/8.90mm non-standard).

ChromaGen™ for Dyslexia

According to the British Dyslexia Association, dyslexia is an umbrella term covering a range of learning related problems. Dyslexia affects more than 16%+ of the population and four times as many males suffer from the condition as females.

Neuroscientist Professor John Stein of Oxford University has estimated that approximately one in three people who suffer from dyslexia could suffer from the visual form that can be helped by using special coloured filters. (BBC News 2nd July 2003)

Dyslexia has nothing to do with intelligence - except that, by definition, almost all dyslexics are much more intelligent than can be predicted by their reading ability. Indeed, some of our most famous are or were dyslexic - Albert Einstein, Richard Branson, Sir Winston Churchill, Toya Wilcox, Susan Hampshire, AA Gill and Anthea Turner, Tom Cruise to name but a few...

ChromaGen™ for Colour Deficiency

'Colour blindness' or colour deficiency affects over 3 million people in the UK in some form or another. Approximately 10% of males are colour deficient but only 0.6-0.8% of females are colour deficient. It is caused by a deficiency of certain chemicals in the retina of the eye.

Defective colour vision can range from near-normal ability to distinguish colours, where typically the chemical for seeing red or green is slightly altered, to a high degree of confusion, where the chemical balance is considerably altered.

In the most severe cases, deeper colours as well as pale colours will be confused, particularly if the lighting is poor

Chromagen is currently only available at our Uckfield store. Please contact us for Chromagen pricing.

Coloured Overlays to Reduce Visual Stress

What are coloured overlays?

There is now scientific research to show that both coloured filters (worn as spectacles) and coloured plastic sheets laid over text (known as overlays) can help some children to read. Coloured overlays are sheets of translucent or transparent coloured plastic that can be placed over a page of a book so as to colour the text beneath without interfering with its clarity.?

What do they do?

Coloured overlays reduce the perceptual distortions of text that children sometimes describe. They enable some children to read text more fluently and with less discomfort and fewer headaches. It is important to assess the effects of a wide range of colours because individuals do not all benefit from the same colour.

What are visual perceptual distortions?

Some people can experience distortions when they look at certain materials, particularly text. The distortions of text include blurring movement of letters, words doubling, shadowy lines, shapes or colours on the page, and flickering. These distortions are characteristic of a condition that some have called Meares-lrlen Syndrome, Irlen Syndrome or Scotopic Sensitivity Syndrome. Individuals with migraine are particularly susceptible to the distortions.

Who benefits?

The people who benefit may be good readers, but more often they have difficulty reading. They usually suffer visual discomfort when reading and, when questioned, will often report perceptual distortions of the text. These distortions usually include apparent movement or blurring of the letters and words. Often there is a family history of migraine.

Why can someone have 'perfect eye sight' and still experience distortion?

An optometrist will report 'perfect eye sight' when someone can see a letter chart without the need for spectacles, and when there are no problems of co-ordination between the eyes. The perceptual distortions may occur quite independently of any focusing? problems, although they are often, but not always, associated with a minor problems of moving the eyes together and keeping the direction of gaze appropriately co-ordinated.

Does visual perceptual distortion occur in families, and if so, why?

Many traits run in families and visual perceptual distortions are no exception. The genetic contribution is the subject of investigation.

Are coloured overlays needed permanently?

It seems that people benefit most from colour if it is offered as soon as any reading difficulty is suspected, before the cycle of failure has begun. Many 7 year-olds appear to use coloured overlays for a year or two and then discard them as unnecessary. This may be because the acquired familiarity with text makes the distortion less distracting.

What do I do to find out if colour might help?

The optometrist will perform an examination with a pack of coloured overlays. and decide which colour, if any, reduces the reported distortions. Another way of assessing benefit is for the examiner to administer the Wilkins Rate of Reading Test .

The rate of reading words on this test is usually more than 10% higher with the chosen overlay than without for someone who will benefit from using an overlay.

Will there be a charge for these an overlay assessment?

The NHS only pays optometrists a small fee for carrying out a basic eye examination. As the assessment is of a specialist nature, requiring a separate appointment we charge a private fee for the detailed investigation of people with reading difficulties.

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