As you read this, your eyes are performing saccades.

The six tiny opposing muscles that control the movement of the eye move about 100,000 times a day. The quick, simultaneous movements of both eyes in the same direction are called “saccades,” from the French term for the motion a rider makes when jerking on the reins. Besides being a great Scrabble word, saccades are the fastest movements produced by the human body.

Optokinetic_nystagmus

Image: Student BSMU at the English language Wikipedia 

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