Researchers asked 12 participants — all of which being legally blind — to test their HoloLens prototype by walking both up and downstairs using the prototype in their preferred settings. Across participants, walking time had a significant increase when walking downstairs with the HoloLens and no significant increase or decrease when walking upstairs with the HoloLens. Participants reported feeling more psychologically secure when using the HoloLens to navigate stairs, though at a smaller rate than with the AR projection-based prototype. 


Results of HoloLens Prototype Study

The HoloLens has a 34° diagonal field of view, whereas the standard field of view with both eyes is nearly 180°. This meant participants found themselves having to angle their heads downwards very frequently in order to see the glow effects, which can be an uncomfortable and unsafe posture to maintain when walking down stairs. 


Limitations of HoloLens Prototype


This prototype visualizes different stages of stairs using colored glow effects: red for upper and lower landings, cyan for the first and last surface level changes, yellow for the step following the first surface level change and preceding the last surface level change, and blue for the middle stairs. The Hololens also generated a path visualization to display the directional trend of the stairs. Beep sonification and audio description were once again utilized in the design. 


University of Michigan - Ann Arbor

Researchers at  Cornell Tech and Columbia University explored the capacity for AR to assist people with low vision in their ability to navigate stairs. They tested two prototypes: a simulated AR projection with a smartphone and a Microsoft HoloLens (a type of smartglass) prototype. 

Stair Navigation with AR

Zhao, Yuhang & Kupferstein, Elizabeth & Castro, Brenda & Feiner, Steven & Azenkot, Shiri. (2019). Designing AR Visualizations to Facilitate Stair Navigation for People with Low Vision. 10.1145/3332165.3347906. 


Designing AR Visualizations to Facilitate Stair Navigation for People with Low Vision


People with low vision may face a reduced sense of depth perception and peripheral vision. Stair navigation therefore proves to be a dangerous mobility challenge, as people with low vision experience higher rates of falling and injuring themselves. Those with low vision may walk slowly, keep their line of vision downwards to see the current tread and the next one, and shuffle their feet to feel the edges. 


Challenge of Navigating Stairs for People with Low Vision


This prototype projects lights onto the edges of stair treads to increase their visibility from a greater distance, while also generating auditory feedback to give an overview of the stair direction and number of treads. Participants in the study were able to choose from three auditory choices — simple sonification in the form of a “ding”, a human voice, and a combination of sonification and the human voice. There were also five projection settings: flash, flashing edge, moving edge, moving horizontal zebra, and moving vertical zebra. Participants could additionally select whether they would like the projections to be blue or a dull yellow.


Learn Before

Related

Learn After