Since the introduction of the Video

Since the introduction of the Video Display Unit (VDU), investigations have been conducted to determine what variables, if any, produce visual fatigue when using a VDU. Human factors researchers have typically investigated relationships between VDU use and visual fatigue by having users subjectively evaluate the extent of their fatigue with a self-report questionnaire. This paper reviews four typical methods of gathering self-report visual fatigue symptoms that appear within the human factors literature.