Ahomonymous hemianopsia is the loss of half of the field of view on the same side in both eyes. It occurs frequently in stroke and traumatic brain injuries due to the connections and wiring of the visual system with the brain. The visual images that we see to the right side travel from both eyes to the left side of the brain, while the visual images we see to the left side in each eye travels to the right side of the brain. Therefore, damage to the right side of the posterior portion of the brain can cause a loss of the left field of view in both eyes. Likewise, damage to the left posterior brain can cause a loss of the right field of vision.
http://www.lowvision.org
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