![]() ![]() Saccades can be elicited voluntarily, but occur reflexively whenever the eyes are open, even when fixated on a target (see Box A). They range in amplitude from the small movements made while reading, for example, to the much larger movements made while gazing around a room. Saccades are rapid, ballistic movements of the eyes that abruptly change the point of fixation. The functions of each type of eye movement are introduced here in subsequent sections, the neural circuitry responsible for three of these types of movements is presented in more detail (see Chapters 14 and 19 for further discussion of neural circuitry underlying vestibulo-ocular movements). There are four basic types of eye movements: saccades, smooth pursuit movements, vergence movements, and vestibulo-ocular movements. ![]()
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