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homonymous hemianopsia : ウィキペディア英語版
homonymous hemianopsia

Hemianopsia or hemianopia is visual field loss on the left or right side of the vertical midline. It can affect one eye but usually affects both eyes. Homonymous hemianopsia, or homonymous hemianopia, is hemianopic visual field loss on the same side of both eyes. Homonymous hemianopsia occurs because the right half of the brain has visual pathways for the left hemifield of both eyes, and the left half of the brain has visual pathways for the right hemifield of both eyes. When one of these pathways is damaged, the corresponding visual field is lost.
== Signs and symptoms ==

Mobility can be difficult for people with homonymous hemianopsia. “Patients frequently complain of bumping into obstacles on the side of the field loss, thereby bruising their arms and legs.”3
People with homonymous hemianopsia often experience discomfort in crowds. “A patient with this condition may be unaware of what he or she cannot see and frequently bumps into walls, trips over objects or walks into people on the side where the visual field is missing.”5
A related phenomenon is Hemispatial neglect, the possible neglect of the right or left. The patient is not conscious of its existence. The right side of the face is not shaven, make up is applied to one side of the face only and only half of a plate of food is eaten.〔Oliver Sacks, The Man Who Mistook His Wife for a Hat〕 This, however, is not necessarily due to a sensory abnormality, and is therefore distinct from hemianopsia.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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