In a self-testing vision screener, examinees use an input device for pointing the orientation of the targets,
which are presented inside the vision screener. Examinees operate the input device without visual
feedback. In the present study, the suitability of pointing devices was evaluated for conditions such as are
present in a self-testing vision screener. The evaluation consisted of an experimental assessment of
pointing accuracy and recording subjective ratings while using the various devices. Six commercially
available computer input devices e a joystick, a gamepad, a trackball, two track pads and a PC mouse -
were evaluated under visual conditions similar to those that would be present when using a self-testing
vision screener