Visual Field Defects in Occipital Lobe Lesions

Nayak, Rajesh R and Garud, Ajita and Kamath, Sumana J (2016) Visual Field Defects in Occipital Lobe Lesions. IJSR - International Journal of Scientific Research, 5 (1). pp. 352-353. ISSN 2277 - 8179

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Introduction: Damage to occipital lobe results in homonymous visual field defects that continue to respect the vertical midline. Purpose: To describe various types of visual field defects seen in occipital lobe lesions and to do a clinic-anatomical correlation of these visual field defects with neuroimaging. Study design: Prospective cross sectional study Methods: All patients detected of occipital lobe lesions on neuroimaging and having hemianopias on visual field as obtained by 30-2 program on the Humphrey field analyzer with a white on white Goldmann Size III target are included and the reliability criteria used will be fixation losses less than 20%, false positive and false negative errors less than 33%.. Rsults: Total 16 patients with occipital lobe lesions detected on neuroimaging were studied. A total of 11 Homonymous hemianopia(68.75%) were complete and 5 HH (31.25%) were incomplete. Homonymous hemianopia with macular sparing (4 HH, 25%) was the most common type of incomplete HH, followed by HH Quadrantanopia(1 HH, 6.25%). Causes of HH included stroke (7 HH, 43.75%), trauma (3, 18.75%), tumor (2, 12.5%), intracranial surgeries(2, 12.5%), meningo- encephalitis (1,6.25%).Conclusion: Causes of Occipital lobe lesions includes stroke, head injury, brain tumours, intracranial surgeries, meningo-encephalitis. These field defects affect a variety of cognitive visual functions. Prognosis of visual field defect is highly variable and depends on cause and severity of brain lesion.

Item Type: Article
Uncontrolled Keywords: Occipital lobe visual field loss, Homonymous hemianopia, Visual field defects after stoke
Subjects: Medicine > KMC Mangalore > Ophthalmology
Depositing User: KMCMLR User
Date Deposited: 22 May 2017 07:21
Last Modified: 22 May 2017 07:21

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