Body & HealthFact
You're blind for hours every day without noticing.
Your eyes jump about 3 times a second in rapid movements called saccades. During each jump, lasting 20 to 200 milliseconds depending on size, the brain suppresses the blurred image. Added up, that is roughly 1 to 2 hours of missing visual input per day. Try it: look in a mirror alternately at your left and right eye. You never see your eyes move.
Useful: The brain hides the gaps so well that a film emerges from what are really still frames.
Source: en.wikipedia.org