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Bilateral or unilateral blindness in one-half of the field of vision.



loss of half of the field of vision; half blindness.

Hemianopsia is described as either multilateral, which is characterized by loss of either the outer or the inner halves of the field of vision, or unilateral (homonymous), in which the same halves of the field of vision (whether right or left) are lost. Hemianopsia occurs with cerebal hemorrhage, cranial injuries, or brain tumors. If the brain tissue is not entirely destroyed, hemianopsia is reversible. The lost field of vision is usually blind to all types of visual sensations, although sometimes perception of the shape of an object, for example, is lost, while perception of color, light, and movement in the same field of vision is preserved. Treatment involves elimination of the primary cause of the hemianopsia.

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Bowers AR, Keeney K, Peli E (2008) Community-based trial of peripheral prism visual field expansion device for hemianopia.
Physical exam revealed weakness, hyperreflexia on the right side and right homonymous hemianopia.
On examination, a left temporal hemianopia was found.
Four of the 70 children with hemianopia had response to movement, especially noted in the peripheral field.
Nichola Burlison, who is married with two young children, has "half blindness", or hemianopia - a homonymous visual field defect, which meant she lost half her vision on the same side in both eyes.
The study tested the technique on patients who suffer from a condition affecting their sight called hemianopia.
More than 4,000 people are affected by hemianopia, a condition which limits sufferers' sight.
The study tested the technique on patients who suffer from a condition called hemianopia, which affects more than 4,000 people in the UK each year.
Hemianopia is a type of visual field defect which means people lose vision on the same side in both eyes.
Typically, patients with progressive multifocal leukoencephalopathy (PML) present with weakness, hemianopia or quadrantanopia, and cognitive abnormalities.
A few days after his death his paper: "On hemianopia and flickering scotoma" (uber Hemianopsie und Flimmerskotom) appeared in the Klinische Monatsblatter.