Mobility performance of low-vision adults using an electronic mobility aid

Area of Science:

• Rehabilitation Engineering
• Assistive Technology
• Human-Computer Interaction

Background:

• Visually impaired individuals face significant challenges in obstacle detection and identification.
• Traditional mobility aids like the long cane offer limited range and poor object identification capabilities.
• Electronic travel aids (ETAs) aim to enhance mobility by providing sensory feedback.

Purpose of the Study:

• To evaluate the mobility performance of visually impaired individuals using the Bristol Mobility Aid (BMA).
• To assess the impact of different BMA headset views on mobility metrics.
• To determine if the BMA enhances object recognition and navigation for people with retinitis pigmentosa.

Main Methods:

• Participants with visual impairments and sighted controls navigated an indoor course using the BMA with three distinct headset views.
• Mobility performance was measured by percentage preferred walking speed (PPWS) and the number of navigation errors.
• Statistical analysis was employed to compare performance across different BMA configurations and vision groups.

Main Results:

• Visually impaired subjects exhibited significantly reduced PPWS in two of three BMA headset views.
• Sighted subjects also showed significantly decreased PPWS across all three BMA views.
• All participant groups made significantly more errors when using the BMA compared to baseline.

Conclusions:

• The Bristol Mobility Aid (BMA) does not currently enhance mobility for visually impaired users.
• Observed reductions in walking speed and increased errors suggest limitations in the current BMA design.
• Future research should focus on design modifications to improve the effectiveness of ETAs like the BMA.