Irlen Syndrome, also sometimes referred to as Scotopic Sensitivity Syndrome, is described by some as a perceptual processing issue that may affect how the brain interprets visual information. It is suggested that individuals with this condition have difficulty processing certain wavelengths of light, potentially causing visual distortions such as text appearing to move or blur on a page.
The condition is sometimes thought to have a genetic component and may be passed from parents to children, although this has not been definitively established.