Five patients with a branch retinal vein occlusion and chronic macular edema of at least one years' duration were treated by photocoagulation. Three of these patients also had recurrent vitreous hemorrhages. Photocoagulation was applied to the quadrant supplied by the occluded vessel, avoiding the foveal and parafoveal areas. All areas of surface neovascularization were treated directly if sufficiently distant from the fovea. Macular edema decreased in all patients. Vitreous hemorrhages did not recur in the three patients with previous hemorrhage. Additionally, many venous channels decreased in caliber, and areas of abnormal vasculature showed a marked decrease in dye leakage. In some patients new collateral anastomosing vessels initially seen in the macula or on the surface of the optic disc atrophied.
Krill AE, Archer D, Newell FW. Photocoagulation in Complications Secondary to Branch Vein Occlusion. Arch Ophthalmol. 1971;85(1):48-60. doi:10.1001/archopht.1971.00990050050008