1. From the Department of Ophthalmology, Federal University of Sa~o Paulo, Sa~o Paulo, Brazil; and the2Henry C. Witelson Ocular Pathology Laboratory, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada.
2. Henry C. Witelson Ocular Pathology Laboratory, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada.
3. From the Department of Ophthalmology, Federal University of Sa~o Paulo, Sa~o Paulo, Brazil; and the