Hemianopsia

(redirected from hemianopia)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

hemianopsia

[‚he·mē·ə′näp·sē·ə]
(medicine)
Bilateral or unilateral blindness in one-half of the field of vision.

Hemianopsia

 

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.

Mentioned in ?
References in periodicals archive ?
"At Newcastle General, we have trained our occupational therapists to recognise this visual problem and we can now identify patients with hemianopia at an early stage.
Scientists from Schepens Eye Research Institute have found patients with hemianopia have significantly more difficulty detecting pedestrians (on their blind side) than normally sighted people.
(1.) A possible statistical solution to the problem would be to use the severity of hemiparesis, apraxia, aphasia, pain, hemianopia, neglect, and other neuropsychological disturbances as covariates.
This study was part of a larger study investigating the driving performance and safety of individuals with homonymous hemianopia and quadrantanopia [2, 3,12, 13].
Age (years) 12 (i) at seizure onset/ 6/9,5 (ii) at last seizure Birth and delivery Uneventful Visual field Right hemianopia Interictal EEG Diffuse spikes and abnormalities waves while awake and diffuse polyspike discharges during sleep, left predominance Ictal EEG Diffuse spike discharge with left predominance Seizure semiology (a) Amaurosis, abnormal eye movement, and unresponsiveness; (b) Head and eye deviation to the right, stiffening with frequent falls; postictal aphasia Treatment LTG + OxCBZ * NA: not available; CBZ: carbamazepine; ESM: ethosuccimide; LTG: lamotrigine; OxCBZ: oxcarbazepine; TPM: topiramate; VPA: valproic acid.
Peripheral 60 - 4 threshold visual field (VF) analysis was done on Humphrey(r) Field Analyzer (720-i series), which revealed right dense, congruous homonymous hemianopia (Fig 3).
If hemianopia occurs in both eyes, it is referred to as homonymous hemianopia.
Researchers at Durham University have been examining Hemianopia to find new ways to help patients whose vision has been affected by strokes.
Although subjects with hemianopia but not spatial neglect may allocate more attention to the contralesional blind field [25], the clinical context suggests that both subjects' leftward errors were pathological.
No motor deficiency was observed, but there was left homonymous hemianopia. On computerized axial tomography, multiple non-acute ischaemic infarcts were observed, together with a hypophysial adenoma with infra- and suprasellar growth which was destroying the posterior clinoid.
Because the posterior cerebral arteries supply the visual cortex and the hippocampus, top-of-the-basilar TIAs and stroke are almost always characterized by visual symptoms, either hemianopia or cortical blindness, and frequently by impairment of recent memory.
Chiasmal compression typically leads to bitemporal hemianopia, (18) and post-chiasmal compression generally leads to homonymous hemianopia.