BRVO vs BRAO: What Are the Differences in Visual Field Changes?
Visual field defects will occur if branch retinal vessels are occluded. The extent and severity of the visual field defects can roughly reflect the vessel distribution area and severity of the retinal damage. The extents of involvement of branch retinal vein occlusion (BRVO) and branch retinal artery occlusion (BRAO) are similar, but the natures of the two diseases are different. BRVO mainly involves the venules and will correspondingly cause chronic ischemia and hypoxia of the retina, whereas BRAO mainly involves the arterioles with the characteristics of acute ischemia, hypoxia, and even severe edema and necrosis of the retina [1–3]. The similarities and differences of the two diseases in terms of visual field defects will be discussed in this section through two cases and literature review.