What are the different categories of phosphenes used in Phosphenism?
We mainly use the type of phosphenes that eye doctors call “after-images”, “images of retinal persistence” or “post-images”, they can be produced in several ways. Also, retinal persistence is one of the most important principles of cinema: in 1829, a Belgian named Plateau, discovered that an image leaves a mark on the retina for one tenth of a second. Thus a series of ten images streaming during a second gives the impression of movement. The first machine designed by this inventor was called the phenakisticope. Phosphenes, with this discovery, had a bright future ahead. We only use and practice with physiological phosphenes and “acouphenes” (tinnitus).
