High Quality Content by WIKIPEDIA articles! Scotopic sensitivity syndrome, also known as Irlen Syndrome and Visual Stress Syndrome, approximating in some ways to Meares Irlen syndrome, and `Visual Stress`, refers to visual perceptual disorder(s) affecting primarily reading and writing based activities. Its existence is not recognized as a homogenous condition by the American Academy of Pediatrics or the American Optometric Association, although its symptomatic occurrence is accepted by the latter and has never been contested by the former (see skepticism below). It is accepted as a homogenous condition however by a respected body of international expert medical opinion, and has been studied in the former Applied Psychology Unit, Cambridge University in the UK, and the Scottish Parliament has also funded a research and treatment centre at the Glasgow Caledonian University, for the associated condition of Meares/Irlen Syndrome.