Taptagaporn S, Saito S
Department of Public Health and Environmental Science, Faculty of Medicine, Tokyo Medical and Dental University, Japan.
Ergonomics. 1990 Feb;33(2):201-8. doi: 10.1080/00140139008927110.
This study ascertained that CRTs using a positive display polarity (dark characters on bright background) are ergonomically more appropriate for VDT operators than ones using a negative display polarity (bright characters on dark background), using both physiological and psychological indices. Differences of pupil size and subjective evaluation of visual comfort while undertaking visual tasks were examined for six experimental conditions (two CRT display types in three different illuminated levels). Pupil diameter was not affected greatly when working with the positive display for different illumination levels. The positive display also caused smaller differences in pupil diameter when viewing visual targets, namely CRT display, script, and keyboard, for all lighting conditions. The majority of the subjects also appreciated working with the positive CRT display at a regular office illumination level.
本研究通过生理和心理指标确定，对于视频显示终端（VDT）操作员而言，采用正显示极性（亮背景上的暗字符）的阴极射线管（CRT）在人体工程学上比采用负显示极性（暗背景上的亮字符）的CRT更合适。针对六种实验条件（三种不同光照水平下的两种CRT显示类型），研究了视觉任务期间瞳孔大小的差异以及视觉舒适度的主观评价。在不同光照水平下使用正显示进行工作时，瞳孔直径受影响不大。在所有光照条件下，观看视觉目标（即CRT显示屏、文稿和键盘）时，正显示引起的瞳孔直径差异也较小。大多数受试者也喜欢在正常办公室光照水平下使用正CRT显示屏进行工作。
