Usability and safety of a HUD during powered chair navigation: A pilot study

Abstract

Ensuring that mixed reality spaces are inclusive to those who have motor impairments requires evaluating and, if necessary, modifying existing technology for the assistive mobility devices they use. Heads-up displays (HUDs) are a common facilitator of virtual augmentations on physical reality, especially for motor vehicles. However, little research to date has explored the efficacy of such displays for powered chairs, which is paramount to ensure safety and effectiveness of use. In this pilot study, we compared (a) transparency of the display (transparent, semi-transparent, and opaque) and (b) presentation mode of the information (text, icon, and text + icon) through dynamic powered chair navigation tasks in a controlled course setup. We found no difference for workload and error among transparency and presentation styles, but a significant difference between presentation styles on delay. These results will be evaluated in full through an mixed reality platform with powered chair users.