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VisualFields-NO-Illustrated

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tcooper's version from 2016-03-20 22:01

Visual Field

 

Question Answer
What values indicate an unreliable HVF?A large number of fixation losses >20% &/or >33% False positives or False negatives
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What monocular visual field defect patterns can be present?Central, Cecocentral, Paracentral, Arcuate/Sector, Altitudinal, Enlarged blindspots
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What bilateral visual field defect patterns can be present?Junctional scotoma, Bitemporal defects, Homonymous defects (w/wo macular sparing, spared temporal crescent),
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A lesion of Wilbrand’s Knee results in what visual field defect?A junctional scotoma
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What is the visual field defect of a junctional scotoma?Central scotoma in one eye & superotemporal defect in fellow eye
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Where is the lesion of a junctional scotoma?At the junction of the optic nerve and chiaslm ipsilateral to central scotoma
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What are the findings of a left optic tract lesion?1. A right homonymous hemianopia (contralateral to lesion), 2. A right RAPD (contralateral to lesion) because more fibers in the optic tract come from the opposite eye, having crossed in the chiasm. 3. Bowtie atrophy of the right optic nerve from atrophy of the nasal half of the macula of the right eye and the nasal retina of the right eye. 4. Mostly temporal pallor of the left optic nerve from atrophy of the temporal retina in the left eye.
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What visual field defect is present with a temporal lobe lesion?A Homonymous hemianopia denser superiorly (“pie in the sky”)
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What visual field defect is present with a parietal lobe lesion?1. A homonymous hemianopsia denser inferiorly (opposite of pie in the sky), 2. Lesions of the parietal lobe often impair optokinetic nystagmus when stimuli are moved in the direction of the damaged parietal lobe.
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What are the findings of occlusion of the posterior cerebral artery?Occlusion of the PCA often results homonymous hemianopia with macular sparing. (The tip of the occipital lobe, where the macular or central homonymous hemifields are represented, often has a dual blood supply from terminal branches of the posterior cerebral artery and of the middle cerebral artery. If the middle cerebral artery is patent, this focal area of the occipital lobe may be spared.)
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What visual field defect is present with exclusive ischemia of the tip of the occipital lobe?A homonymous hemianopia that is small and centrally located. (An embolic infarction of either a distal MCA or PCA branch can result in exclusive ischemia of the tip of the occipital lobe, thereby producing a small homonymous scotomatous defect if there is inadequate collateral circulation.)
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A stroke of the occipital lobe sparing its anterior portion may cause what finding?A homonymous hemianopia with sparing of the temporal crescent on the ipsilateral side
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What are the findings of bilateral occipital lobe lesions? 1. Bilateral Homonymous hemianopias, 2. Possible decrease visual acuity that is equal in each eye. Unless additional pathology present anterior to chiasm.
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