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Evaluation Method of Fatigue Caused by Video Data Terminal Operations

Described is a new type of measuring instrument for testing the visual strain, in which a series of Landolt's rings are demonstrated on the VDT display utilizing the personal computer, and a new evaluation method of fatigue caused by video data terminal operation, which is proposed based on data of fatigue measured using this new measuring instrument. The visual strain caused by continuous VDT operations was measured using this new type of measuring instrument. The mental stress was investigated based on the results of the evaluation. Based on the two results of our experimental study, a new "Evaluation Method of Fatigue Caused by VDT Operations" is proposed.