The series of involuntary, abrupt, rapid, small movements or jerks of both eyes simultaneously in changing the point of fixation.

An abrupt voluntary shift in ocular fixation from one point to another, as occurs in reading.

Saccade, fast, intermittent eye movement that redirects gaze. Saccades may involve the eyes alone or, more commonly, the eyes and the head. Their function is to place the fovea, the central region of the retina where vision is most acute, onto the images of parts of the visual scene of interest....