Guidelines for diagnosis and treatment of patients with retinal vein occlusion

Retinal vein occlusion (RVO) is defined as a retinal vascular disorder which is typically manifested by the overlapping, dilation and tortuosity of the retinal veins, predominantly by means of intraretinal haemorrhages and intraretinal edema, retinal ischemia including cotton wool spots, hard exudates and macular edema [1-8]. As soon as an area of the fovea is afflicted by macular edema, a deterioration of central visual acuity (VA) takes place, which leads to progressive and sometimes acute, painless loss of sight.