1. From the UPMC Eye Center, Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; the2New England Eye Center, Tufts-New England Medical Center, Tufts University School of Medicine, Boston, Massachusetts; and the
2. From the UPMC Eye Center, Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; the
3. Massachusetts Institute of Technology, Cambridge, Massachusetts.