EFFECTS OF VISUAL AND MENTAL STRAIN ON VDT PERFORMANCE

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  • KUMASHIRO Masaharu
    Department of Human Factors Engineering, School of Medicine, University of Occupational and Environmental Health
  • MIKAMI Koki
    Department of Industrial Engineering, Hokkaido Institute of Technology
  • HASEGAWA Tetsuya
    Department of Human Factors Engineering, School of Medicine, University of Occupational and Environmental Health

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Other Title
  • ＶＤＴ作業における眼精疲労と中枢性ストレスの検討
  • VDT サギョウ ニ オケル ガンセイ ヒロウ ト チュウスウセイ ストレス

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Abstract

The progression of visual and mental strain in VDT work was investigated through an experimentally-designed VDT task providing a number of stressors including pacing, repetition, judgment and output decisions. We measured the effects of CFF (critical fusion frequency), TAF (the ability to maintain concentration), EEG (electroencephalogram) and near-point accommodation of various changes in the duration of the testing period. The subjects were seven male university students who performed single multiplication problems at a rate of 60 per minute. The problems were presented to them on a CRT screen and on paper for periods of 90 min each.<br>The results obtained were as follows;<br>1) CFF values and near-point accommodation of VDT performance were significantly decreased compared to Non-VDT's as a control. The TAF test showed that the mental strain in a VDT task is greater than that in a Non-VDT task.<br>2) CFF values of VDT performance showed a tendency to decline in the 30th min after commencement, but in the 60th min and thereafter a significant lowering was noticed.<br>3) In TAF and near-point accommodation of VDT performance, the greatest decline was in the 60th min, and this was significantly reduced only immediately after the work period.<br>4) CFF values and near-point accommodation were not recovered after 60 min from the end of a 90 min VDT task. However, TAF·L values recovered in the 30th min after VDT performance.<br>5) The peak level of alpha waves from the parietal region moved toward the slow alpha band with the elapse of VDT task time, but returned [or reverted] to the initial state 30 min after the test period ended.

Journal

  • Sangyo Igaku

    Sangyo Igaku 26 (2), 105-111, 1984

    Japan Society for Occupational Health

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