1. From the Retina and Optic Nerve Research Laboratory and2Departments of Ophthalmology and Visual Sciences, and3Physiology and Biophysics, Dalhousie University, Halifax, Nova Scotia, Canada; and
2. From the Retina and Optic Nerve Research Laboratory and3Physiology and Biophysics, Dalhousie University, Halifax, Nova Scotia, Canada; and
3. Departments of Ophthalmology and Visual Sciences, and
4. Alcon Research Ltd., Fort Worth, Texas.