Only a few studies in the literature have focused on the effects of age on fatigue susceptibility and hand operation performance in virtual environments, and even less research has been carried out focusing on older adults. This study aimed to assess the hand movement performance in a virtual environment with two group measures, including visual fatigue and depth perception. A total of 10 adults (5 young adults and 5 older adults) participated in this study. This study was conducted in the following order: pre-CFF measurement, performance of a Fitts’ Law task with stereoscopic viewing, post-CFF measurement every 10 min (during task), and recording of task movement time and error rate after each condition of the task. This study found significant effects of age and task index of difficulty on hand movement. Compared to the older adults, the young adults appeared to have better hand movement performance. Regarding eye fatigue, eye fatigue was significantly higher at binocular parallax of 9 cm than at 6 cm and 3 cm. Surprisingly, age had a significant effect on hand movement performance but not on visual fatigue. This study suggests that the operation time should be less than 20 min and that parallax should be 6 cm (visual angle = 1.38 degrees) to prevent visual fatigue when movement tasks are performed in a virtual environment. These data highlight the potential for age-related differences in hand movement performance during the performance of tasks in which fast and accurate selection are required in combination with the manipulation of 3D objects in a virtual environment, and the study provides directions for further exploration.

中文翻译：

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虚拟环境下年龄对眼疲劳及手部操作性能影响的研究

文献中只有少数研究关注年龄对虚拟环境中疲劳易感性和手部操作性能的影响，而针对老年人的研究则更少。本研究旨在通过两组措施评估虚拟环境中的手部运动表现，包括视觉疲劳和深度知觉。共有 10 名成年人（5 名年轻人和 5 名老年人）参与了这项研究。本研究按以下顺序进行：CFF 前测量、Fitts 定律任务的立体观察执行、CFF 后每 10 分钟（任务期间）测量，以及在每个条件下记录任务移动时间和错误率任务。本研究发现年龄和任务难度指数对手部运动有显着影响。与老年人相比，年轻人似乎有更好的手部运动表现。关于眼睛疲劳，双眼视差 9 cm 处的眼睛疲劳明显高于 6 cm 和 3 cm 处。令人惊讶的是，年龄对手部运动表现有显着影响，但对视觉疲劳没有影响。本研究建议，在虚拟环境中执行运动任务时，操作时间应小于20分钟，视差应为6厘米（视角=1.38度），以防止视觉疲劳。这些数据突出了在执行任务期间手部运动表现可能与年龄相关的差异，在这些任务中需要快速准确的选择并结合虚拟环境中的 3D 对象操作，该研究为进一步探索提供了方向。