Related Experiment Video
Updated: Jul 14, 2026
09:29
A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
Published on: February 11, 2014
Relationships between feature search and mobility performance in persons with severe visual impairment
Patti S Fuhr1, Lei Liu, Thomas K Kuyk
1Birmingham VA Medical Center, University of Alabama at Birmingham, Birmingham, Alabama 35233, USA. patti.fuhr@va.gov
Summary
Visually impaired individuals struggle with feature search and mobility. Their visual search speed significantly predicts their performance in mobility tasks, highlighting a key link for rehabilitation.
Area of Science:
- Vision science
- Rehabilitation science
- Human factors
Background:
- Visual search involves feature discrimination and wide field-of-view processing.
- Understanding the relationship between visual search and mobility is crucial for visually impaired (VI) individuals.
Purpose of the Study:
- To investigate the association between feature search capabilities and mobility performance in subjects with severe visual impairment.
Main Methods:
- Forty-four visually impaired subjects performed feature search tasks with varying set-sizes and field-of-view dimensions.
- Mobility was assessed on indoor obstacle courses under different lighting conditions.
Main Results:
- Visually impaired subjects exhibited slower, error-prone feature search but processed information in parallel.
- Mobility performance was significantly correlated with feature search speed, with search speed explaining substantial variance in mobility outcomes.
Conclusions:
- Feature search reaction time serves as a reliable predictor of mobility in visually impaired patients.
- These findings suggest potential for visual search training to improve mobility in VI populations.
