Augmented Reality (AR) is expected to be applied to manuals for assembling or inspecting tasks instead of traditional paper-based ones. Our previous study revealed that when an AR manual was experimentally used for a wiring task, efficiency became higher and human error decreased. However, in order to practically apply AR manuals in actual work situations, some human factor requirements should be clarified in advance. Thus, in this study, we attempt to make it clear what kinds of effects they have on performance by some conditions or restrictions. Particularly considering that a user wears a head-mounted display (HMD) and sees images presented by that superimposed on the real view, we examine the effects of those through some experiments. From the results, we found that a monocular HMD is better to be worn on non-dominant eye, that information of an AR manual should be given part by part or one by one when the real view is complicated, and so on. We suggest conditions that do not affect their performance, or rather that enhance it in actual work situations, in this study.
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