Hand-eye coordination was the ability of the vision system to coordinate the information received through the eyes to control, guide, and direct the hands in the accomplishment of a given task. Ping pong was considered a great test of hand-eye co-ordination. (VOY: "Relativity") Klingons used the exercise Hehh-duHpp to teach infants hand-eye coordination so they could grow up to become warriors. (DS9: "Time's Orphan")