This book provides a comprehensive overview of the current state of the art in assistive technology for persons with visual impairment, as well as coverage into promising new research directions. Beginning with a brief overview of the pathology and psychophysical aspects of low vision and blindness, the text proceeds with in-depth descriptions of current technology to support independent mobility and orientation, information access (printed information, tactile information, and computers), and life activities (education, work, entertainment), as well as future directions related to the technology for blindness and visual impairment.