saccade

/səˈkɑːd/
noun
  1. A quick, jerky movement of the eye as it jumps from one point to another, especially while reading or looking around.
    • During the visual search, her saccades were rapid and precise.
    • The scientist tracked the patient's saccades to test their eye coordination.
    • When you read a sentence, your eyes make a series of saccades from word to word.