hemianopsia
Hemianopsia - loss of half (or quarter) of the field of view. There is usually with organic lesions of the visual pathway (in brain tumors, traumatic brain injury, and others.). There are the same name and oppositely hemianopsia. At the same homonymous hemianopsia drop side of the field of vision of both eyes - right or left. For heteronymic hemianopsia loss characteristic of either internal or external visual fields of both eyes. Hemianopsia is an important diagnostic sign of the defeat of a section of the visual pathway. It may be permanent or temporary symptom that depends on the nature and severity of the visual pathway.
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