Authors' Note: Loss of sight in half of the visual field in an eye is a medically well-characterized and significant lesion known as hemianopsia, or occasionally hemianopia. An attack on the underlying lesion, often deep within the brain is in the province of neurosurgeons, and often a multidisciplinary team is needed. The bitemporal pattern discussed here, involving the lateral half of each eye's visual field, is less common than homonomous hemianopsia. For further reading on this topic, the Wikipedia article is suggested.
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