The occipital The occipital lobes Occipital lobe - Mahidol University
The occipital The occipital lobes Occipital lobe - Mahidol University
The occipital The occipital lobes Occipital lobe - Mahidol University
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23/06/54Types of visual field defectsNormalvisual fieldRighthomonymoushemianopiaPictures from WikipediaTypes of visual field defectsQuadrantanopia• Contralateral homonymousinferior quadrantanopia =lesion of optic radiation deepin parietal <strong>lobe</strong>• Contralateral homonymoussuperior quadrantanopia =lesion of optic radiation deepin temporal <strong>lobe</strong>Types of visual field defectsMacular sparingPresence of“macular sparing”= <strong>occipital</strong> <strong>lobe</strong>lesionPicture from www.acbvi.org<strong>Occipital</strong> <strong>lobe</strong> lesions• Damage to areas 18, 19, and 37 (adjacentparietal <strong>lobe</strong>) – responsible for visualassociation may cause varying degrees ofpsychic blindness– Visual agnosia = inability to recognize objects bysight– Alexia = inability to readAgnosia• <strong>The</strong> clinical term applied to disorders in whicha patient is unable to attach meaning orsignificance to perceived sensory stimuli(difficulty in identification or recognition)• Visual agnosia = inability to recognize objectsby sightVisual agnosias• Prosopagnosia = the inability to recognizepreviously familiar faces• Visual motion agnosia• Object agnosia = the inability to identify iffamiliar objects by sight• Achromatopsia = visual agnosia limited tocolor perception18
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