How Many Times Does the Human Eye Move (Saccades) in a Day?
A saccade is a rapid, jerky movement of both eyes between two or more phases of fixation. Unlike smooth pursuit, which follows a moving object, saccades are ballistic, meaning once the brain initiates the jump, it cannot change the destination. These movements are necessary because only the central 2 degrees of our retina can see in high definition. To create a seamless picture of the world, the brain must constantly snap the fovea to different points of interest. During these jumps, the brain momentarily shuts off visual processing, a phenomenon known as saccadic suppression, to prevent us from seeing a nauseating blur.
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