1. From the Department of Ophthalmology, Harvard Medical School and the Massachusetts Eye and Ear Infirmary, Boston, Massachusetts; the2Center for Innovative Visual Rehabilitation, Veterans Administration Hospital, Boston, Massachusetts; the
2. Department of Electrical Engineering and Computer Science and the4Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts; and the
3. From the Department of Ophthalmology, Harvard Medical School and the Massachusetts Eye and Ear Infirmary, Boston, Massachusetts; the
4. Center for Innovative Visual Rehabilitation, Veterans Administration Hospital, Boston, Massachusetts; the5Nanofabrication Laboratory, Cornell University, Ithaca, New York.