1. From the Departments of Ophthalmology (D.M.C., J.F.R.) and Radiology (M.E.C.), Massachusetts Eye and Ear, the Department of Medicine, Massachusetts General Hospital (J.H.S.), and the Departments of Ophthalmology (D.M.C., J.F.R.), Radiology (M.E.C.), and Medicine (J.H.S.), Harvard Medical School — all in Boston.