Trackball

A trackball is a pointing device consisting of a ball housed in a stationary socket that the user rotates to move the on-screen cursor, with buttons nearby for clicking. Unlike a mouse, a trackball does not require arm movement across a surface, making it valuable for people with limited range of motion, tremors, or fatigue-related conditions. Trackballs come in various sizes — from small finger-operated models to large ball designs that can be operated with a palm, foot, or chin. For people with motor impairments, trackballs can reduce the physical effort of cursor control, though fine accuracy for small targets may still be challenging. Virtual cursor enhancements like enlarged active areas can further assist trackball users by reducing the precision required for target selection.