Alternative Pointing Systems for Mobility Impaired People

Access to an alternative pointing device has become even more important for mobility impaired people with the advent of graphically-oriented operating systems. There are many alternative systems to be considered. The control surface of trackballs is easier to manipulate and the buttons can be activated without affecting the pointer position. Some trackballs, like those made by Kensington, offer additional buttons for functionalities such as double-clicking, click and hold, and other commands. It can also be programmed to a person’s specific needs. A standard mouse or trackball can be placed on the floor for someone who can’t use his hands but can move his feet.

Mainstream computer stores and supply catalogs can give an idea of other alternative pointers available. The ideal pointing systems may differ from person to person. Some may find external touchpads useful, while others may find handheld pointing devices (ProPoint - Interlink Electronics) easier for them. Mobility impaired people using a joystick driven wheelchair may find the Roller Joystick (Penny & Giles) best for them.

HeadMouse (Origin Instruments) or HeadMaster (Prentke Romich) would be appropriate for a person with good head control but without the ability to control a mouse or alternative pointing device with any limb. Infrared detection and a transmitter or reflector on head-controlled pointing systems translates head movements into mouse-pointer movement on the computer screen. Use of an additional switch replaces the mouse button. A head pointing system combined with an on-screen keyboard allows full computer access to someone who cannot use a standard keyboard and mouse.

Source: University of Washington