1. From the Departments of Ophthalmology and
2. From the Departments of Ophthalmology and 2Biomedical Engineering, Duke University Medical Center, Durham, North Carolina; and
3. From the Departments of Ophthalmology and the 3Department of Ophthalmology, Columbia University, New York, New York.
4. the Department of Ophthalmology, Columbia University, New York, New York.