Augmented reality (AR) is being used increasingly in a number of domains for task assistance. Evolving augmented reality solutions may require more than one display screen in certain scenarios. Switching between the display screens repeatedly, in order to gather information, would thus be required in such AR environments. Repeatedly switching between the display screens will require the users to change their attention continuously. Additionally, the eye lens will have to accommodate at different distances when viewing the information presented on multiple display screens. These repeated accommodation demands, to change the focus of the eye lens, will put additional strain on the accommodation mechanism of the eye, thereby increasing visual fatigue. Attention switching and increased accommodation demands will eventually affect human performance. The human visual system will also be affected by the amount of light it is exposed to. It is understandable that the brightness of the display in an AR environment with respect to the ambient light would affect the visual fatigue induced in the users and eventually impact their performance. This study was aimed at studying the effect of repeated eye lens accommodation, attention switching and display screen brightness on human performance and visual fatigue, under typical illumination conditions. It was observed that medium brightness level induced least visual fatigue and resulted in highest performance levels in a room well lit by LED luminaries. Repeated eye lens accommodation and attention switching, involved in screen switching, were found to induce visual fatigue and adversely affect human performance.

增强现实 (AR) 越来越多地在许多领域用于任务辅助。在某些情况下，不断发展的增强现实解决方案可能需要多个显示屏。因此，在这种 AR 环境中，需要在显示屏之间重复切换以收集信息。显示屏之间的反复切换将需要用户不断改变注意力。此外，当观看多个显示屏上呈现的信息时，眼睛晶状体必须适应不同的距离。这些改变眼睛晶状体焦点的重复调节需求会给眼睛的调节机制带来额外的压力，从而增加视觉疲劳。注意力转移和住宿需求的增加最终会影响人类的表现。人类视觉系统也会受到其所接触的光量的影响。可以理解的是，AR 环境中显示器相对于环境光的亮度会影响用户的视觉疲劳，并最终影响他们的表现。本研究旨在研究典型照明条件下重复的眼睛晶状体调节、注意力切换和显示屏亮度对人类表现和视觉疲劳的影响。据观察，中等亮度水平引起的视觉疲劳最少，并且在 LED 灯具照明良好的房间中可实现最高的性能水平。研究发现，与屏幕切换相关的反复眼睛晶状体调节和注意力切换会引起视觉疲劳，并对人类表现产生不利影响。