Dwell Control

An input method in which a user activates a target — such as a button, link, or key — by holding a pointer or gaze over it for a specified period of time rather than clicking or tapping. Dwell control is essential for users who interact via head tracking, eye tracking, or other pointer-based assistive technologies where a physical click action is not possible. The dwell time threshold must be carefully calibrated: too short and accidental activations occur; too long and the interface becomes fatiguing and slow to use.