VDT作业对视觉运动系统影响的工效学研究

The Ergonomics Study on the Change of Eye Movement System Under VDT Work

利用AR（自回归）模型，对VDT（计算机系统的视屏终端）作业前后水平方向固视微动中的漂移成分进行频域分析，以及对无意识跳跃成分的振幅、速度的统计分析，研究VDT作业的视负荷对眼球固视运动系统的影响，及其与视觉疲劳之间的关系，探讨利用固视状态下的眼球运动评价视觉疲劳的可能性.

In order to inveshgate the change of eye movement system of VDT operators,horizontal involuntary eye movement during fixation on a small target is measured by photo-electric recording of comeal reflection before and after 2-hours VDT work. Power spectrum of drift is eshmated with the autoregressive model. Both the Amplitude and velocity of flick are obtained. For 2-hours VDT work, the significant decrease in the amplitude and velocity of flick, in the power of spectrum of drift is recognized as of l% more or less. Near point distance (NP) and subjective symptoms are also measured during VDT work. NP and subjective symptoms show the visual fatigue.The correlation between the increase of NP and the change of involuntary eye movement is recognized.It is concluded that the variation of involuntary eye movement can be applied to evaluate visual fatigue.