A) "A Pilot, Open-Label Study of the Safety, Tolerability, and Bioactivity of Multiple Intravitreal Injections of Ranibizumab in Subjects with Macular Edema Secondary to Vein Occlusions.", B) "Extended follow-up of patients with macular edema due to bRanch rETinal vein occlusion (BRVO) or centrAl retinal veIn occlusioN (CRVO) previously treated with intravitreal ranibizumab (RETAIN) " C) "RanibizumabDosE Comparison (0.5mg and 2.0mg) and the Role of LAser in the ManagemenT of REtinal Vein Occlusion - A Pharmacodynamic Approach (RELATE)"