If you’re familiar with visual stress, you may have come across the term “Meares-Irlen Syndrome”. In this post, we explore why Meares-Irlen isn’t universally recognised in clinical settings, where it originally came from, and what you can do if you’re experiencing symptoms when looking at text or high-contrast patterns.
If you look up visual stress online, chances are you’ll come across the term “Meares-Irlen Syndrome”. Yet, in the UK, Meares-Irlen Syndrome isn’t a formally recognised clinical diagnosis. The term originally emerged in the 80s when teacher Olive Meares and educational psychologist Helen Irlen used it to describe visual perceptual difficulties (specifically “scotopic sensitivity”) that hindered reading. Despite this, their theories are often contested, and the terms are generally not recommended for use in contemporary clinical research settings.
When describing visual discomfort and perceptual distortions associated with high‑contrast patterns and text, current UK guidance generally uses the term ‘visual stress’. Although the effects of visual stress can be very real for the individuals experiencing them, there’s no clear consensus that visual stress is a disorder. Instead, it’s seen as a way to label visual symptoms that affect some people when viewing repetitive, high-contrast patterns or engaging in intensive near-work like reading.
Both Meares-Irlen Syndrome and Irlen Syndrome have been used to describe the discomfort or difficulty some people experience when viewing certain visual patterns or text. The key difference is that Meares-Irlen Syndrome acknowledges the research of both Olive Meares and Helen Irlen, while Irlen Syndrome is the specific branding used by the Irlen Institute and its practitioners, often linked to their “Scotopic Sensitivity” theory.
In many online articles, you’l notice that Irlen Syndrome, Meares-Irlen Syndrome and visual stress are used interchangeably, but this can be misleading. Current UK guidance generally uses “visual stress” as the more appropriate descriptive term, while Irlen Syndrome and Meares-Irlen Syndrome are not currently classified as medical or ophthalmological conditions by major UK health bodies.
It’s also worth noting that Irlen-based screening and assessment services are not part of a regulated clinical framework in the UK, so it’s important to seek advice from a qualified eye-care professional if you’re experiencing symptoms.
Visual stress is the preferred way to describe visual discomfort and perceptual distortions associated with high‑contrast patterns and text. A person with visual stress might experience:
While these symptoms can occur in people with perfectly normal vision, they can also overlap with refractive errors, binocular vision problems, or migraine. That’s why it’s so important to book an appointment with an optometrist if you’re experiencing symptoms. Visual stress should only be considered after other possible visual or medical causes have been ruled out through a comprehensive assessment.
It’s rare for visual stress to affect individuals all the time. It usually arises in situations that involve sustained visual effort, particularly where there is strong contrast or repetitive patterning. Common scenarios include:
Did you know? Research indicates a link between visual stress and dyslexia. Although visual stress isn’t a learning difficulty, it occurs more often in individuals with dyslexia, compared with the general population. So, if visual stress symptoms appear alongside obvious signs of dyslexia, you may also benefit from a dyslexia assessment by an SpLD assessor.
If you relate to symptoms of visual stress, it’s vital to book a comprehensive eye examination and sight test with a qualified eye care professional, as they’ll first need to rule out other possible causes.
If they decide you need a further assessment for visual stress and you meet the symptom criteria, you may be able to explore adjustments that could help ease visual discomfort. This will allow you to figure out what works best for you. You might want to try:
It’s important to note that coloured overlays and tinted lenses aren’t recognised as a treatment for dyslexia or other specific learning difficulties (SpLDs). While they may help to ease visual symptoms for some people, they don’t address the underlying phonological or cognitive factors associated with dyslexia, and shouldn’t be viewed as a replacement for appropriate educational support or intervention.
Although Meares‑Irlen Syndrome isn’t considered an “official” disorder or diagnosis, you can reach out to your employer for support with visual stress, especially if it’s having a noticeable impact on your ability to carry out daily tasks. You may want to chat to your manager about reasonable adjustments, such as:
Concerned that visual difficulties at work may be related to your display screen equipment? Take a look at our guide to DSE Safety and Accessibility at Work.
No. Meares‑Irlen Syndrome isn’t a recognised clinical diagnosis in the UK and therefore isn’t classified as a disability. However, the symptoms of visual stress can affect reading comfort, and reasonable adjustments (e.g. modified lighting or reduced contrast materials) may help some individuals.
Visual Stress can co‑occur with reading difficulties, but it’s vital to understand that it isn’t a cause of dyslexia, nor is it an alternative explanation for ADHD. Claims suggesting misdiagnosis or high overlap are not always supported by credible research and should be treated with caution.
It’s less about whether symptoms are “real” and more about how we name them. While the visual phenomena people experience are well-documented, medical experts in the UK don’t generally agree that these symptoms add up to a standalone medical syndrome. The term visual stress is more consistent with current evidence and refers to a group of symptoms rather than a specific condition.
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