New research shows that a treatment for retinal vein occlusion yields long-lasting vision gains, with visual acuity remaining significantly above baseline at five years. However, many patients require ongoing treatment. Retinal vein occlusion is one of the most common blinding conditions in the United States; without treatment, central retinal vein occlusion (CRVO), the most severe type of retinal vein occlusion often leads to significant and permanent vision loss. Retinal vein occlusion is caused by a blockage of the veins carrying blood away from the retina, the light-sensitive tissue at the back of the eye. The most effective treatment, injections of...