hemianopsia


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Related to hemianopsia: binasal hemianopsia

hemianopia

 [hem″e-ah-no´pe-ah]
defective vision or blindness in half of the visual field; usually applied to bilateral defects caused by a single lesion. adj., adj hemianop´ic, hemianop´tic.
Patient Care. Visual field deficit on one side often occurs as a result of stroke syndrome. Patients with this problem are unable to perceive objects to the side of the visual midline. The visual loss is contralateral, i.e., it is on the side opposite the brain lesion. To facilitate self care, commonly used articles such as the water pitcher, meal tray, and call bell are placed on the unaffected side. The patient should be approached from and communicated with while standing or sitting on the side in which vision is best. When in visual contact with the patient, caregivers should move slowly toward and past the visual boundary to stimulate scanning to the affected side. Auditory and visual stimulation on the affected side can help improve and maintain residual sight on that side.
Visual field defects associated with hemianopia. From Polaski and Tatro, 1996.
homonymous hemianopia hemianopia affecting the right halves or the left halves of the visual fields of both eyes. The patient must turn the head from side to side to compensate for the defect. Often it is due not to any pathology in the eye itself but to damage to the optic tract or occipital lobe.

hem·i·a·no·pi·a

(hem'ē-ă-nō'pē-ă),
Loss of vision for one half of the visual field of one or both eyes.
Synonym(s): hemianopsia

hemianopia, hemianopsia

hemianopia

Loss of vision in one half of the visual field of one eye (unilateral hemianopia) or of both eyes (bilateral hemianopia) (Fig. H1). Syn. hemianopsia. See quadrantanopia; hemianopic pupillary reflex.
absolute hemianopia Hemianopia in which the affected part of the retina is totally blind to light, form and colour.
altitudinal hemianopia Hemianopia in either the upper or lower half of the visual field. A common cause is anterior ischaemic optic neuropathy.
binasal hemianopia Hemianopia in the nasal halves of the visual fields of both eyes.
bitemporal hemianopia Hemianopia in the temporal halves of the visual fields of both eyes.
congruous hemianopia Hemianopia in which the defects in the two visual fields are identical. A common cause is a lesion in the posterior optic radiations.
heteronymous hemianopia A loss of vision in either both nasal halves (binasal hemianopia) or both temporal halves of the visual field (bitemporal hemianopia). A common cause of the latter is a lesion in the optic chiasma.
homonymous hemianopia A loss of vision in the nasal half of the visual field of one eye and the temporal half of the visual field of the other eye. Left homonymous hemianopia is a loss of vision in the temporal half of the visual field of the left eye and the nasal half of the visual field of the right eye. Right homonymous hemianopia is a loss of vision in the temporal half of the visual field of the right eye and the nasal half of the visual field of the left eye. Common causes are occlusion of the posterior cerebral artery (stroke), trauma and tumours. See macular sparing.
incongruous hemianopia Hemianopia in which the defects in the two affected visual fields differ in one or more ways. A common cause is a lesion of the optic tract.
quadrantic hemianopia See quadrantanopia.
relative hemianopia Hemianopia involving a loss of form and colour but not of light.
hemianopia spectacles See hemia-nopic spectacles.
Fig. H1 Complete, bitemporal hemianopia due to a large pituitary tumour compressing the optic chiasmaenlarge picture
Fig. H1 Complete, bitemporal hemianopia due to a large pituitary tumour compressing the optic chiasma

hemianopsia

hemianopia.
References in periodicals archive ?
2003) 29/M Disfuncion hipofi-siaria, hemianopsia bitemporal 26/M Panhipopituitarismo, hiperprolactinemia Murao et al.
We assume that by applying a rigorous exercising program to patients with homonym hemianopsia in which the therapeutic conduct takes into consideration its presence there is an improvement of the functional level of the patients compared to those with the same pathology in which the therapeutic program "omits" the presence of the homonym hemianopsia.
Hemianopsia reduces the width of the perceptual span, causing letters, numbers, and words to fall onto the blind portion of the field.
Los tumores secretores producen sindromes clinicos caracteristicos, mientras que los no secretores, por ser silenciosos se manifiestan como hemianopsia bitemporal, sintomas de hipertension endocraneana o hipopituitarismo.
Symptoms included blurred vision in 31 patients, bright spots in 15, zigzag lines in 7, dark spots in 5, diplopia in 4, transient blindness in 3, and hemianopsia in 2.
Symptoms include acute decompensation of cortical function, aphasia, hemiplegia, and/or hemianopsia.
Evaluation of the visual fields showed left homonymous hemianopsia.
She had a preferential left gaze, right facial droop, and right homonymous hemianopsia.
A 42-year-old man presented with bitemporal hemianopsia and decreased visual acuity.
Five volunteers then joined the speaker on the stage to don glasses that simulated common eye diseases of the elderly: macular degeneration, glaucoma, cataracts, hemianopsia (blindness in part of the field of vision, common after a stroke), as well as yellowing of the lenses.
Ischemic symptoms associated with the carotid system include hemiparesis, hemianesthesia or hemiparethesia, hemiagnosia, hemiapraxia, hemianopsia, and hemiaphasia.
The prognosis for function after brain infarct is mainly related to the severity of the paralysis [4-5], but other features such as decrease in cognition [6, 7], depression, incontinence [8, 9], sensory apraxia, and hemianopsia [10, 11] are also relevant to prognosis.