1. From the Departments of Ophthalmology and Visual Sciences and2Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri; the
2. From the Departments of Ophthalmology and Visual Sciences and3Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ontario, Canada; and the
3. From the Departments of Ophthalmology and Visual Sciences and
4. Yerkes Regional Primate Research Center, Atlanta, Georgia.