Under natural viewing conditions, the eyes are always in motion.
Small eye movements continually occur even when attempting fixation (the maintenance of steady gaze on a single point).
Experiments in the early 1950s established that stabilized images result in the fading and disappearance of the visual percept, possibly due to retinal adaptation to a stationary field.
[2][3][4] Images can be stabilized mechanically with optics mounted on the eye itself, or the image can be continually updated on a display to counteract the effects of eye movements.
[5] Because no existing method creates perfect image stabilization, this leaves open the question of whether all perfectly stabilized images disappear completely.