Fig. 3. Fluorescein angiograms demonstrating different grades of macular leakage in Behçet retinal vasculitis. Grade 1, incomplete perifoveal hyperfluorescence (A); grade 2, mild 360° hyperfluorescence (B); grade 3, moderate 360° hyperfluorescence with the hyperfluorescent area being approximately 1 disc diameter across (C); grade 4, severe 360° hyperfluorescence with the hyperfluorescent area being approximately 1.5 disc diameters across (D).