The association is so weak that the colour of the overlay provides little, if any, guide to the colour of the optimal coloured lens. The condition of adaptation is different for that of an overlay because it is just one surface colour among many colours, and it is illuminated with white light. It is because of this difference in adaptation that there is only a weak association between the optimal overlay colour and the optimal lens tint. When tinted lenses are worn, the entire visual field is coloured. The eyes adapt to the colour in a manner similar to the adaptation that occurs when the light source itself is coloured. As such, the overlay colour cannot be used to select the lens colour. While both coloured overlays and coloured lenses can improve reading fluency, their optimal chromaticities differ.
The outcome will be more effective as a portable filter that you can wear in any environment or condition. They can be selected with great precision and accuracy. Opticalm offers assessment services to help you find the optimal colour for lenses. A better and more convenient solution is precision tinted lenses. While overlays are effective for reading, visual strain and discomfort are often experienced when performing other visual tasks such as writing or working from a smart board. Overlays are a useful tool to identify individuals who might benefit from wearing precision tinted lenses to filter their whole visual environment.
Overlays as a screening tool for precision tinted lenses Randomised controlled trial of the effect of coloured overlays on the rate of reading of people with specific learning difficultiesĬoloured overlays and their effect on reading speed: a reviewĬoloured overlays and their benefit for reading There are many research papers demonstrating the effectiveness of overlays in improving reading ability by reducing visual, perceptual and physical symptoms: If you find that the benefit changes over time, you may no longer need to use the overlay, or your optimal colour may have changed as your brain has adapted to the use of colour. The overlay colour may work best when placed over white paper and not be as effective when placed over different colours of paper. While many prefer the matte side, the glossy side is sometimes preferred for the brightness of the colour.Īdjust the angle of the reading material to reduce reflection from lights. To use the overlay, place it directly over your reading material, making sure it has complete contact with the page so there is no space between the paper and the overlay.
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