saccade

noun

short, quick, simultaneous movement of both eyes between two or more phases of fixation in the same direction; random eye movement

Pronunciation: /səˈkɑːd/

Etymology: Etymology tree French saccadebor. English saccade Borrowed from French saccade.

A rapid movement of the eye (either voluntary or involuntary) from one focus to another. (Often described as a jerky movement, but this word denotes all such quick eye movements, which happen continually, not just exaggerated or weird ones, and not nystagmus.)
“He added the bill with a single saccade of his pulsing eyes.”
“Then 130 milliseconds or thousandths of a second later, each made a "saccade" - an extremely fast eye movement - to roughly where the ball was likely to bounce.”
The act of checking a horse quickly with a single strong pull of the reins.
The sounding of two violin strings together by using a sudden strong pressure of the bow.
Any sudden jerking movement.

Etymology: Etymology tree French saccadebor. English saccade Borrowed from French saccade.