01634 757227
Call Me

Eye Tracking, Coloured Overlay Assessment and Meares-Irlen Syndrome

Some individuals with apparently normal eyesight, experience discomfort when viewing a page of print. Some report that the words appear to move, wobble or flicker while others say that the page seems too bright or the words are too close together. This condition is sometimes known as Meares-Irlen syndrome and is particularly prevalent in, although not exclusive to, people with dyslexia. Those affected by the condition may skip words or lines when reading. Others report eyestrain or headaches after reading.

Meares-Irlen or visual stress which can cause the following symptoms

 These symptoms are sometimes relieved by placing a coloured overlay over the print or by wearing spectacles with tinted lenses. The colour required to achieve optimum relief varies between individuals and may change over time. To measure the precise tint needed for an individual an assessment is needed.

Measuring the problem, finding the solution

For many years we have been using coloured overlays and precision tinted lenses to help improve reading speed and comfort. To assess the need for these we used to conduct something called a coloured overlay assessment which involves gauging reading speed and comfort while using precision tints on a computer screen.

Although coloured overlays and spectacles have helped many of our clients, the methods of testing have, until now, not been able to identify reading problems caused by muscle imbalances which affect a far higher proportion of the population.  Coloured overlay testing, even when computerised, is very subjective and relies heavily on the person’s responses and opinion- something which can be very variable depending on the person. The Optometrist can also influence such tests. Testing reading ability especially in the very young, old or those who struggle to read has therefore always presented challenges. Thankfully a new piece of technology has revolutionised the way we can detect reading difficulties and taken the subjective element out of measurement.

The Clinical Eye Tracker uses tiny cameras mounted on a computer which detects and follows the position of the eyes to within less than 1 degree. While you sit and look at the screen which shows various visual stimuli, the cameras monitor your eye positions and track movements 60 times per second. (The cameras watch your eyes from a computer screen, nothing touches your eye.)
The intelligent software then analyses the effect this has on your reading ability and allows us to help correct any problems.

Because the Eye tracker is making physical measurements of the eye with no subjective opinion, we can quantify the degree of the problem, measure the effectiveness of any treatment (spectacles, coloured lenses, overlays or exercises) and monitor progress even in the youngest clients.

If we identify an eye-tracking issue, we then measure the effectivity of spectacles and coloured lenses on eye stability, reading speed and comfort.

Example of Eye Tracking Measurements

Eye Tracking before OverlayImproved Eye Tracking using coloured overlay

The first image above shows eye-tracking measured in an 8-year-old before any intervention and the second image shows the improvement with a pink overlay. As you can see the overlay considerably reduces the eye wandering and jumping.

Below the images show the same child's eye saccades (movements) moving from letter to letter and then back to the start of the next line of writing. The second image which uses the overlay shows a much smoother transition between letter and line than without any overlay. This represented an increase in reading speed of 600%.

Eye Tracking Saccades without overlayEye Tracking Saccades with coloured overlay


The Eye Tracking assessment

The eye-tracking assessment which includes measuring reading speed, eye tracking function and effectivity of coloured lenses on these outcomes takes 30-40 minutes. The cost of the appointment starts at £195.

It is essential that an up-to-date eye examination has been performed before the eye-tracking assessment. An eye examination can help to identify any focusing issues, binocular vision problems or health issues which may also be contributing to any reading difficulties. Please ensure any current spectacles are brought to your appointment.

Treatment of reading difficulties with coloured overlays and precision tints

Coloured overlay test examination for dyslexia visual stress and Meares-Irlen syndrome at opticians Buchanan Optometrists, Kent

For some people, the contrast between black letters and white paper causes overstimulation in part of their brain which causes reading to be difficult. By finding the perfect tint to help alleviate these symptoms reading can often be significantly improved.

What if the assessment shows my eye tracking and reading need to be helped?

If the assessment shows a coloured overlay to improve your reading and eye-tracking, you will be able to take an overlay to use at school, work or home. The improvement in reading is often evident from day one (read Isaac's story below) but can also continue to improve further over time. After three months of use, if the overlay has been helpful, a further assessment will be conducted to measure the tint required for spectacle lenses (the overlay and spectacle colour differs). Having tinted lenses means you can use the tint for writing, board work and TV as well as reading.

If the assessment indicates the need for spectacles or eye exercises, these can be prescribed immediately to start giving you the help you need.

Book your Eye Tracking assessment today on 01634 757227


Some of the clients who have been helped by eye-tracking and coloured overlay assessments

Reading left Isaac in tears of frustration. Find out how just three weeks later he happily reads whole books.

 Isaac is a bright, lively 7-year-old who had struggled with reading ever since starting at school. His mum and school had tried everything to help improve his reading. He was prescribed spectacles by another optician but didn’t like wearing them and found no improvement in his reading. He had one-to-one help with reading at school but was making little progress when one of his teachers suggested that he have a coloured overlay test to see if it would help.

Isaac’s mum was keen to try anything that may help, so brought him in for an assessment. On examining Isaac, it was apparent that reading presented many challenges. He felt the page was bright, glaring and words appeared too close together. His reading ability was at the lowest range expected for his age. Reading often left Isaac tired and frustrated, and concentration was extremely difficult. When testing Isaac for coloured overlays, it was immediately apparent that the overlays made the print more bearable to look at. He experienced less glare, and the words appeared ‘more comfortable’. His speed of reading immediately improved with the overlay, so we gave him one to try out at school.

 Three weeks later Isaac returned. Since starting using his overlay, in just three weeks, Isaac had improved two reading levels at school and had suddenly started enjoying reading. His reading assistant was so astounded she came to find his mum in the playground to tell her the good news. On his second visit to the practice, he asked his mum to bring books with him to read while he was waiting. For a child who previously ‘hated’ reading this is a massive turnaround.

Here’s what Isaac’s delighted mum had to say about it.

Isaac was referred to the opticians for an Irlen’s coloured overlay test by his school. Kathryn checked him and gave him a leaf-green overlay to use at school. Within a few weeks of using the overlay Isaac’s reading had improved amazingly along with his confidence. Isaac is now reading books in 5 minutes that only three weeks ago took him 20minutes and usually ended in tears of frustration. He has already improved two levels in reading books. Three weeks ago he couldn’t read the word ‘but’, he now reads words like ‘Lamborghini!’ He loves his overlay so much that he was really upset when the school cut it to a smaller more usable size for him. He never reads without it. Thank you, Kathryn, for your patience.’

Neil's story told by his mum Caroline

Neil is a seven and a half-year-old lovable boy and twin. Since starting school, he has struggled with reading and writing, falling behind not only his twin brother but his peers also. Despite repeated concerns raised with the school just to be told ‘it’s his age, he will grow out of it’ and ‘he’s a boy, boys develop slower than girls’ I knew something wasn’t quite right. Opening the reading books or comparing writing with his twin brother only reinforced the differences between them. Failure to meet the Year 2 School Attainment Test (SATs) national target resulted in Neil being independently assessed by a special educational needs co-ordinator (SENco) and an independent Dyslexia screen which showed ‘High probability’ of dyslexia. I had almost resigned myself to the fact that Neil was Dyslexic as he showed the common traits of lack of concentration; muddling letters such as ‘p’ and ‘q’ and ‘b’ and ‘d’; missing words out of a sentence; skipping lines in text; and a general apathy towards learning.

It was by chance that I was recommended Buchanan Optometrists for a Dry-Eye condition (which I would like to add they sorted and changed my blurry world into a clear one stopping my headaches and ability to read clearly) and whilst in the waiting room I read a leaflet all about colour overlays and thought ‘that’s my Neil’. The test was worth every penny and Neil was made to feel relaxed and cared for. I must admit I cried due to the relief a reason for him falling behind at school could easily be helped and also from guilt at having never heard of this before and not asking the right questions regarding words moving on the page and others.

Within 24 hours the teacher had made the whiteboard blue (Neil’s colour), and he could see what was on the board (not just a jumble of patterns). The coloured overlay makes an instant difference in Neil’s reading, and I invested in coloured blank and lined paper for his writing and worksheets. Two months on, all Neil’s dyslexic symptoms are gone, he has reached the national reading target; in fact,  Neil is overall a different child, more confident now he can participate in learning and is like a sponge soaking it all up. We have invested in the glasses with colour tinting to make Neil’s world a better place and help him with television, the computer and the world in general clearer.

It is the best investment we ever made, and I now have an amazing child made even more amazing and much happier. Buchannan Optometrists are experienced in testing and helping children like Neil, and they have been more than great through supporting both Neil and me through this difficult time. -  Caroline, Neil's mum

(SENDCo Click Here to order leaflets for your pupils)