1. From the Departments of Psychology and 2Ophthalmology, Columbia University, New York, New York;
2. From the Departments of Psychology and
3. Retina Foundation of the Southwest, Dallas, Texas; and
4. Ophthalmology, Columbia University, New York, New York;
5. Retina Foundation of the Southwest, Dallas, Texas; and 4Department of Ophthalmology, UT Southwestern Medical School, Dallas, Texas.