Improving Mobility Performance in XXXX With a Distance-Based Representation of the Visual Scene.

@entity1 @entity227 @entity4064
Purpose: Severe @entity227 can have a profound impact on personal independence through its effect on mobility. We investigated whether the mobility of @entity1 with vision low enough to be registered as blind could be improved by presenting the visual environment in a distance-based manner for easier detection of obstacles. Methods: We accomplished this by developing a pair of "residual vision glasses" (RVGs) that use a head-mounted depth camera and displays to present information about the distance of obstacles to the wearer as brightness, such that obstacles closer to the wearer are represented more brightly. We assessed the impact of the RVGs on the mobility performance of @entity227 @entity1 during the completion of a set of obstacle courses. @entity1 position was monitored continuously, which enabled us to capture the temporal dynamics of mobility performance. This allowed us to find correlates of obstacle detection and hesitations in walking behavior, in addition to the more commonly used measures of trial completion time and number of collisions. Results: All @entity1 were able to use the smart glasses to navigate the course, and mobility performance improved for those @entity227 @entity1 with the worst prior mobility performance. However, walking speed was slower and hesitations increased with the altered visual representation. Conclusions: A depth-based representation of the visual environment may offer @entity4064 @entity1 improvements in independent mobility. It is important for further work to explore whether practice can overcome the reductions in speed and increased hesitation that were observed in our trial.
