1. From the Center for Visual Science, Department of Brain and Cognitive Sciences, Department of Ophthalmology, University of Rochester, Rochester, New York;
2. Vanderbilt Vision Research Center, Department of Psychology, Vanderbilt University, Nashville, Tennessee;
3. Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio;
4. Department of Special Education, Department of Ophthalmology and Visual Sciences, Vanderbilt University, Nashville, Tennessee