Can you believe if a person who can completely see is blind almost 40 mins to an hour per day? This phenomenon is called Saccadic Masking and also known as (visual) Saccadic suppression. It is a visual illusion where the brain selectively blocks visual processing during our eye movements.
A saccade is a quick, simultaneous movement of both eyes between two or more phases of fixation points in the same direction. Humans become effectively blind during a saccade.
This phenomenon was first described by Erdmann and Dodge in 1898. They noticed during unrelated experiments that a person could never see the motion of their own eyes. Go on, check it by seeing into a mirror and looking from one eye to another.
When your eyes look from one point to another, we don’t see everything in a continuous smooth stream just like a shaky camera captures the video. We view it as a series of individually separate and distinct blurry images when the eyes pause. These blurry and shaky images are separated by a period of temporary blindness. Our brain does not like this motion blur images between those viewing points. So the brain automatically deletes the blurry details and the blackness that occurs several times a second, every moment you use your eyes.
There are two major types of saccadic masking.
The inability to see a flash of light during a saccade is called flash saccadic suppression.
The inability to notice whether a target has moved or not during a saccade is called saccadic suppression of image displacement. For instance, when comparing both the images, you would have hardly noticed that the right side image misses the eyebrows of the horse and a butterfly.
Well, you are likely spending somewhere around 40 minutes a day with your eyes wide open and completely blind.
Watch the video for more details.
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https://en.wikipedia.org/wiki/Saccadic_masking
https://en.wikipedia.org/wiki/Saccade
http://www.todayifoundout.com/index.php/2015/05/saccadic-masking/
http://www.cracked.com/article_17103_5-ways-your-brain-messing-with-your-head.html
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