1. Richard E. Hoover Rehabilitation Services for Low Vision and Blindness, Greater Baltimore Medical Center, 6569 North Charles Street, PPW 305, Baltimore, MD 21204
2. Helen Keller Professor of Visual Rehabilitation, Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, England
3. College of Optometry, State University of New York, 33 West 42nd Street, New York, NY 10036
4. Richard E. Hoover Rehabilitation Services for Low Vision and Blindness, Hoover Services, Greater Baltimore Medical Center