Original sentence: Saccadic movements.Vergences - Vergences are eye movements involving both eyes in which each eye moves in opposite directions.Versions - Versions are eye movements involving both eyes in which each eye moves in the same direction
Edited sentence: Saccadic movement.Vergences - A vergence is an eye movement involving both eyes in which each eye moves in opposite directions.Versions - A version is an eye movement involving both eyes in which each eye moves in the same direction