Dr. Neil Bressler, James P . Gills Professor of Ophthalmology at Johns Hopkins University School of Medicine and Chief of the Retina Division at the Wilmer Eye Institue in Baltimore, Maryland will enable participants to understand the limited differences on visual acuity and macular edema when applying panretinal photocoagulation in 1 sitting vs. multiple sittings in eyes without macular edema that are receiving panretinal photocoagulation to prevent or treat proliferative diabetic retinopathy.