Why human persistence of vision is common to all visual devices that can display motion?
To display the details of motion, several frames of still photos are displayed so quickly, keeping blank screen in between successive frames. If persistence of vision were absent in the human system, then flickering will be unavoidable and a bitter fate in enjoying motion pictures. Hence persistence of vision is a boon! Due to this persistence, well before the damping of vibrations in our biological system(retina) the next frame will be shown and hence there comes a continuity in viewing the motion pictures without any nuisance of flickerring.
