IEEE Trans Vis Comput Graph. 2019 Jun;25(6):2228-2241. doi: 10.1109/TVCG.2018.2832633. Epub 2018 May 3.
In augmented reality (AR) environments, information is often distributed between real world and virtual contexts, and often appears at different distances from the user. Therefore, to integrate the information, users must repeatedly switch context and refocus the eyes. To focus at different distances, the user's eyes must accommodate, which when done repeatedly can cause eyestrain and degrade task performance. An experiment was conducted that examined switching context and focal distance between a real and an AR environment, using a text-based visual search task and a monocular optical see-through AR display. Both context switching and focal distance switching resulted in significantly reduced performance. In addition, repeatedly performing the task caused visual fatigue to steadily increase. Performance was particularly poor for virtual text presented at optical infinity, and for target letters that participants tried to read before their eyes had completely accommodated to a new focal distance. The results show that context switching and focal distance switching are important AR user interface design issues.
在增强现实 (AR) 环境中，信息通常分布在真实世界和虚拟环境之间，并且经常出现在用户不同距离的位置。因此，为了整合信息，用户必须反复切换上下文并重新聚焦眼睛。为了在不同的距离聚焦，用户的眼睛必须适应，而反复这样做可能会导致眼睛疲劳并降低任务绩效。进行了一项实验，使用基于文本的视觉搜索任务和单目光学透视式 AR 显示器，研究了在真实和 AR 环境之间切换上下文和焦距。上下文切换和焦距切换都会导致性能显著下降。此外，反复执行任务会导致视觉疲劳逐渐增加。对于呈现于光学无穷远处的虚拟文本，以及对于参与者在眼睛完全适应新焦距之前试图阅读的目标字母，性能特别差。结果表明，上下文切换和焦距切换是 AR 用户界面设计的重要问题。
