照度和对比度对于视觉显示终端视觉功能的影响

EFFECTS OF ILLUMINANCE AND VDT LUMINANCE CONTRAST ON VISUAL PERFORMANCE

本研究试图通过视觉显示终端的视觉功能研究,了解图象在荧光屏上的亮度对比度、荧光屏照度以及不同光源对于视觉功能的作用。图象在荧光屏上的亮度对比是影响阅读速度的重要因素,同时,荧光屏照度增加时,阅读速度降低。为了提高工作效率,可以提高图象在荧光屏上的亮度对比,也可以降低荧光屏照度。我们似乎可以推荐合适的荧光屏照度为50—200Lux。这时水平工作面照度是70—340Lux。

This research was intended to explore the effecs of VDT luminancecontrast, illuminance and two different light sources on visual performa-nce. Results of a series of related experimental studies show that VDTluminance contrast is the major parameter affecting the speed of readingChinese characters on the VDT screen. The results also suggest that thereading speed decreases as VDT illuminance increases. In order to improvevisual performance under the condition of VDT, we could either increaseVDT luminance contrast or decrease VDT illuminance,. or both. In thelight of these results, our recommanded VDT illuminance ranges from 50to 200 lux. At this VDT illuminance level, the illuminance of the hori-zontal working plane is 70-340 lux under our experimental condition.