1. From The Center for Innovative Visual Rehabilitation, VA Medical Center, Boston, Massachusetts; the
2. From The Center for Innovative Visual Rehabilitation, VA Medical Center, Boston, Massachusetts; the2Department of Ophthalmology, Harvard Medical School and the Massachusetts Eye and Ear Infirmary, Boston, Massachusetts; and the
3. From The Center for Innovative Visual Rehabilitation, VA Medical Center, Boston, Massachusetts; the3Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts.
4. Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts.