Saito S, Sotoyama M, Saito S, Taptagaporn S
National Institute of Industrial Health, Kawasaki, Japan.
Ind Health. 1994;32(2):57-66. doi: 10.2486/indhealth.32.57.
In spite of the clarification of some significant physiological factors of visual fatigue caused by VDT work, pupillary reflexes have not been studied as to how they are affected after prolonged visual work. This study examined visual function changes objectively in terms of pupillary reflexes and lens accommodative responses after a 4-hr VDT operation task. The relationship between the two functions was also examined. Two measurements in this paper revealed the physiological function changes due to VDT operation. The subjects involved were five students with an average age of 22.6 years. First, near-reflex measurement ascertained decreases in amplitude and the velocity of accommodation function after the visual task. Second, light-reflex measurement revealed a delay of the reflex, an increase in the amplitude of the reflex, and a decrease in pupil size after the visual task. A weak correlation between the decrease in pupil size and accommodation function was found. The occurrence of visual fatigue due to 4-hr VDT operation was also confirmed by CFF measurements and reported subjective visual symptoms in this experiment.
尽管已经阐明了一些由VDT工作引起的视觉疲劳的重要生理因素，但关于长时间视觉工作后瞳孔反射如何受到影响，尚未进行研究。本研究客观地检测了在进行4小时VDT操作任务后，瞳孔反射和晶状体调节反应方面的视觉功能变化。还检测了这两种功能之间的关系。本文中的两项测量揭示了由于VDT操作导致的生理功能变化。参与研究的受试者为5名平均年龄22.6岁的学生。首先，近反射测量确定了视觉任务后调节功能的幅度和速度下降。其次，光反射测量显示视觉任务后反射延迟、反射幅度增加以及瞳孔大小减小。发现瞳孔大小减小与调节功能之间存在弱相关性。在本实验中，通过临界闪光融合频率（CFF）测量以及报告的主观视觉症状，也证实了由于4小时VDT操作导致视觉疲劳的发生。
