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Saccadic eye movement
Extremely fast, small, jerky voluntary eye movements to redirect the line of sight, allowing the eyes to fix on a still object as the head turns or the person moves. Saccadic eye movements are common during reading. Saccadic eye movements are also known as saccades. Saccadic comes from the Greek word "saccader" meaning "to jerk," and the Greek word "ikos" meaning "pertaining to." Put the two words together and you get "pertaining to jerking."
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