Saccade n. : A sudden, violent check of a horse by drawing or twitching the reins on a sudden and with one pull.

Example:
question for and about the person on here named Saccade

Taxonomy
saccades, eyes, the eye, eye movement, saccadic, amplitude, saccadic masking, adaptation, the brain, saccadic eye movements, avian, Humans and other animals, free encyclopedia, movements, velocity, onset, oscillations, phases.

Defination from the web:
saccade reaches up to 1000°/sec in monkeys (somewhat less in humans) ... A successful antisaccade requires inhibiting a reflexive saccade to the onset location, and voluntarily moving the eye in the other direction. ...