Many studies have shown the benefits of augmented reality (AR) to improve manufacturing and control processes in industry. However, the presentation of AR content through optical see-through head-mounted displays may induce unnatural viewing conditions, which consequences on the user’s visual system have not been investigated yet. This study aimed at assessing whether using AR instructions to guide a manual task, i.e., conditions where the user is forced to repeatedly look at and accommodate in different planes to extract information from both real and virtual environments, could potentially impact the visual system of operators. A before/after design study was carried out, asking 26 participants to perform Lego assemblies for 30 min with either paper or AR instructions. The effects of using AR compared to paper instructions were evaluated both on binocular vision, with classical optometric measurements, and on visual fatigue, with the Virtual Reality Symptoms Questionnaire. No clinically significant differences in optometric measurements (far/near visual acuity, stereoacuity, phoria, convergence, fusional amplitude, accommodation amplitude, accommodative convergence) have been found between AR and paper instructions, and only negligible fatigue symptoms have been seen specifically for AR. Results from both objective and subjective measurements suggest that there is no impact of AR on the oculomotor system and that, in this specific case of use, AR can be safely used for production operators.

许多研究表明增强现实（AR）可以改善工业中的制造和控制流程，从而带来好处。但是，通过光学透明头戴式显示器显示AR内容可能会导致不自然的观看条件，这尚未对用户视觉系统造成影响。这项研究旨在评估是否使用AR指令来指导手动任务，即，用户被迫反复注视和适应不同平面以从真实和虚拟环境中提取信息的条件，可能会影响操作员的视觉系统。进行了一项之前/之后的设计研究，要求26名参与者用纸质或AR指令进行30分钟的Lego组装。使用虚拟现实症状问卷调查，通过传统的验光测量对双眼视觉和视觉疲劳进行了评估，将AR与书面说明相比的效果进行了评估。在AR和纸质说明之间未发现在验光测量方面的临床显着差异（远/近视敏度，立体视敏度，验光，会聚，融合幅度，调节幅度，适应性会聚），并且仅发现可忽略的疲劳症状。客观和主观测量的结果都表明，AR对动眼系统没有影响，在这种特定的使用情况下，AR可以安全地用于生产操作人员。虚拟现实症状问卷调查。在AR和纸质说明之间未发现在验光测量方面的临床显着差异（远/近视敏度，立体视敏度，验光，会聚，融合幅度，调节幅度，适应性会聚），并且仅发现可忽略的疲劳症状。客观和主观测量的结果都表明，AR对动眼系统没有影响，在这种特定的使用情况下，AR可以安全地用于生产操作人员。虚拟现实症状问卷调查。在AR和纸质说明之间未发现在验光测量方面的临床显着差异（远/近视敏度，立体视敏度，验光，会聚，融合幅度，调节幅度，适应性会聚），并且仅发现可忽略的疲劳症状。客观和主观测量的结果都表明，AR对动眼系统没有影响，在这种特定的使用情况下，AR可以安全地用于生产操作人员。并且仅出现了微不足道的AR疲劳症状。客观和主观测量的结果都表明，AR对动眼系统没有影响，在这种特定的使用情况下，AR可以安全地用于生产操作人员。并且仅出现了微不足道的AR疲劳症状。客观和主观测量的结果都表明，AR对动眼系统没有影响，在这种特定的使用情况下，AR可以安全地用于生产操作人员。