1. From the Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts; the
2. New England Eye Center, Tufts-New England Medical Center, Tufts University, Boston, Massachusetts; and the
3. From the Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts; the2New England Eye Center, Tufts-New England Medical Center, Tufts University, Bos
4. UPMC Eye Center, Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.