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Hemianopsia(hemianopsia; from the Greek. half, en ... and sight) -visual defect, consisting in the loss of half the field of vision of each eye.
Occurs with organic. lesions of the visual pathway in its various sections in vascular pathologies and brain tumors. Depending on the nature and severity of the main. disease and degree of damage to the visual pathway may be a temporary or permanent symptom.
The most common trace. G. species. Homonymous G., characterized by loss of the same view of view - right or left. Develops with the defeat of the optic tract, outdoor. of the cranked body, int. capsules, occipital lobe of the cerebral cortex. Heterinemic G., which is characterized by loss of int. (binasal) or externally. (bitemporal) fields of vision.
Binasal G is observed when the carotid artery aneurysm, bitemporal G. - with pituitary tumors. Quadrant G. - loss of a quarter of the visual field. Can be the top, as a consequence of pathological. process in the bottom. parts of the temporal lobe of the brain, and the bottom - with pathology in the upper, parts of the temporal lobe.
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