4 Basic types of eye movements:
- Saccades: Rapid, ballistic movements of the eyes that abruptly change the point of fixation. Usually reflexive in nature, whether you are fixating on a target or not.
- Smooth Pursuits: Much slower tracking movements of the eyes designed to keep a moving stimulus on the fovea. Very much voluntary, as the viewer can choose whether to follow the target or not. Very hard to do without an actual stimulus.
- Vergence: The alignment of the fovea of each eye with targets located at different distances from the viewer. The per-eye vergence movements are disconjugate - the eyes’ lines of sights either converge or diverge to see objects.
- Vestibulo-Ocular Movements: The stabilization of the eyes relative to the outside world, usually through head movements. I.E. reflex responses that cause the head and eyes to move differently in order to prevent target stimuli from slipping. Specifically, the vestibular system detects changes in head movements and produces corrective, rapid eye movements