Visual stress affects many individuals who experience discomfort and perceptual distortions when reading printed text. The Visual Stress Coloured Overlay Test helps identify this condition by allowing the user to try different colored transparent sheets over text to find a shade that reduces eye strain, headaches, and reading difficulties. Scientific studies show that the right coloured overlay can improve speed and accuracy by calming visual cortex hyperexcitability. Widely used by vision professionals and educators, this non-invasive test is a simple yet effective first step in diagnosing and alleviating visual stress symptoms, particularly for those with reading challenges.