Irlen overlays are the first step in helping someone who has been identified as having Irlen Syndrome. Once the symptoms have been identified, the next step is to put the different coloured overlays over the printed page to see if it removes the visual distortions and discomfort being experienced by the client. It is really important that once the preferred coloured overlays are selected, that they are used to determine if they actually help the reading. The overlays are simply removing some of the wavelengths of light that are causing the distortions, but they help word recognition. It is like someone neding reading glasses, trying to read without them and then putting them on. The effect is immediate.