What causes visual stress?
Here at Leightons Opticians & Hearing Care we are able to carry out some specialised examinations for those people who suffer with visual stress.
"Visual Stress" is where processing of text is atypical. This can lead to reading difficulties, headaches and other visual problems when reading text. Visual stress is not the same as dyslexia, although the two conditions can commonly occur together.
The general consensus is that visual is caused by hypersensitivity in the visual system. Coloured filters calm the visual system down and allow the individual to process the information more effectively.
And it’s not just children who benefit. Adults do, too.
There are different types of coloured filters or lenses that can be used to help relieve visual discomfort. Overlays are the cheapest and most simple method if coloured filters help, for just a few pounds you can simply place a coloured acetate film over the text you are reading. Private tests are offered by some optometrists or dispensing opticians which can help find out which colour filter is going to work best. Precision tinted lenses are created to a precise colour which aims to reduce visual discomfort and can often be a more specific colour compared to the overlay.
Colorimetry and tinted spectacles can also be useful for those with migraines, photo-sensitive epilepsy or acquired brain injuries.
Coloured filters are not a cure for dyslexia and might not help every patient experiencing visual discomfort, dyslexia or reading problems.
Does your child find it difficult to read?
Here are some tips to spot if your child is suffering from visual stress:
- They're reluctant to read
- They’re falling behind in their reading age
- They complain the print hurts their eyes
- They rub their eyes whilst reading
- They’re fidgety and unwilling to sit down and read
- They may have behavioural issues – linked to the discomfort of reading
How visual stress affects your sight
Far from being an ordered grouping of lines and text, here’s how the page could look to someone with visual stress…
- Words on the page wobble, move, are ghosted, blurred, overlap or have a 3D appearance
- They can see shapes appearing on the page
- They find the white of the page very bright, often seeing rivers of white running through the page
- Their eyes jump between lines, and they have difficulty tracking along the page
Tips for avoiding visual discomfort:
- Avoid bright light and glare – try to use blinds or close curtains where possible
- Adjust screen position to reduce glare on screens from overhead lights
- Take regular breaks from screens
- Hold digital devices further away to reduce eye tiredness
Coloured Overlay Assessment
During the examination, we try a number of acetate plastic sheets in various colours to determine if colour will help reduce the discomfort experienced.
Coloured overlays are especially great for young children and students as they are cheap and easy to use. Coloured overlays can only be used to assist reading paperwork/books, we recommend that it is used for around 6 weeks before coloured spectacles lenses are considered.
If coloured overlays are successful, and colour is needed to help with writing, distance vision or computer use, we move on to a test called 'colorimetry'.
Colorimetry testing tells us what colour tinted spectacles to prescribe. The overlay test does not work in the same way as colorimetry, which is why there are separate types of tests. In colorimetry a light box is used with lots of coloured filters, a very specific colour is determined along with its density.
We have had lots of great success with coloured overlays and tinted spectacles. Many people report a significant improvement in both the comfort, speed of reading and comprehension. Some children have found they may jump several reading ages in a short space of time.
To arrange a visual stress test you will need an up-to-date eye examination. Please contact your local branch to discuss booking your visual stress examination. You can also do this over the phone on 0800 40 20 20 now. We look forward to finding out if colour could help you!