1. From the Department of Mathematics and Statistics, San Diego State University, San Diego, California;
2. Discoveries In Sight, Devers Eye Institute, Legacy Health System, Portland, Oregon;
3. the Departments of Ophthalmology and Visual Sciences and4Neurology and Neurological Surgery, University of California, Davis, Sacramento, California; and the
4. Department of Ophthalmology and Visual Sciences, Washington University, St Louis, Missouri.