Eye gaze control extends eye-tracking beyond simple cursor movement into full device operation, including augmentative and alternative communication (AAC) devices where a user builds sentences by looking at symbols or letters on a grid. It is common among people with conditions like ALS, cerebral palsy, or severe spinal cord injuries.
Interfaces that rely on precise, small targets or fast interaction timing create real barriers for gaze-based users, since gaze naturally drifts more than a mouse cursor and needs either larger targets or a dwell-based confirmation step to select accurately.