ABSTRACT
The importance of visual information has been steadily increasing with the progress of the modern computer information revolution. Hence, simultaneous measurement of three major ocular functions — accommodation, eye movement and pupil diameter — in a real working environments, is being demanded in many fields such as ergonomics, ophthalmology, physiology and psychology. The evaluation of visual fatigue induced by prolonged VDT (visual display terminal) work is one such example. Although researchers have tried to achieve this goal, few have fully succeeded.
