Characteristic Visual Field Defects of Patients with Occipital Lobe Infarction: Homonymous Hemianopia and Macular Sparing

2019 ◽  
pp. 517-526
Author(s):  
Xiaobin Xie ◽  
Ning Fan ◽  
Ningli Wang
Keyword(s):  
Visual Field ◽  
Occipital Lobe ◽  
Homonymous Hemianopia ◽  
Visual Field Defects ◽  
Field Defects ◽  
Macular Sparing

Transitory and permanent visual field defects induced by occipital lobe seizures

1999 ◽  
Vol 20 (5) ◽  
pp. 321-325 ◽  
Author(s):  
G. Valli ◽  
S. Zago ◽  
A. Cappellari ◽  
A. Bersano
Keyword(s):  
Visual Field ◽  
Occipital Lobe ◽  
Visual Field Defects ◽  
Field Defects

Clinical Study of the Visual Field Defects Caused by Occipital Lobe Lesions

2014 ◽  
Vol 37 (2) ◽  
pp. 102-108 ◽  
Author(s):  
Katsuhiko Ogawa ◽  
Hiroshi Ishikawa ◽  
Yutaka Suzuki ◽  
Minoru Oishi ◽  
Satoshi Kamei
Keyword(s):  
Clinical Study ◽  
Visual Field ◽  
Occipital Lobe ◽  
Visual Field Defects ◽  
Field Defects

Retrogeniculate Visual Field Defects

Visual Fields ◽  
2010 ◽  
Author(s):  
Thomas R. Hedges III
Keyword(s):  
Visual Field ◽  
Vision Loss ◽  
Visual Fields ◽  
Field Testing ◽  
Visual Field Defects ◽  
Automated Perimetry ◽  
Loss Of Vision ◽  
Data Points ◽  
Field Defects ◽  
Macular Sparing

Automated perimetry has changed visual field testing considerably in recent years. What was considered an art has become an exercise in interpreting a set of data points obtained mechanically. Automated perimetry saves ophthalmologists time, which ideally should allow for more visual fields to be obtained on patients with unexplained vision loss. However, one must still keep in mind that automated perimetry still depends on the subjective responses from the patient. More important, automated perimetry has made interpretation of visual field defects, especially those due to occipital lesions, more difficult. For example, macular sparing may not be reflected, especially with programs limited to the central 24° or 30°. A 10° field may be required to show macular sparing. Also, sparing or involvement of the temporal crescent will not be shown with 24° or 30° visual fields. The limitation of most programs may lead to the appearance of incongruity when in fact the field is indeed congruous. Sometimes, a small homonymous hemianopic scotoma will be detected when one eye is tested but will be completely missed when the other eye is tested, giving the false impression that the visual loss is monocular. This is especially problematic if the patient also falsely interprets his or her homonymous loss of vision as monocular. Such individuals may complain of loss of vision in one eye when in fact it is one half of their visual field that is defective. The strategy of automated testing on either side the vertical and horizontal meridians may lead to the false impression that field defects respect the vertical or horizontal meridian when they do not. Automated perimetry should make it possible to test more patients with unexplained vision loss, but all automated visual fields must be interpreted with caution and, when necessary, substantiated with some other method, such as the tangent screen, which remains the most powerful method of detecting the size, shape, and density of visual field defects. Because most ophthalmologists no longer use tangent screen testing, at least an Amlser grid should be used to qualify the nature of a paracentral visual field defect.

Recovery of visual-field defects after occipital lobe infarction: a perimetric study

2010 ◽  
Vol 82 (6) ◽  
pp. 695-702 ◽  
Author(s):  
M. Celebisoy ◽  
N. Celebisoy ◽  
E. Bayam ◽  
T. Kose
Keyword(s):  
Visual Field ◽  
Occipital Lobe ◽  
Visual Field Defects ◽  
Field Defects

scholarly journals Relative Afferent Pupillary Defects in Homonymous Visual Field Defects Caused by Stroke of the Occipital Lobe Using Pupillometer

2017 ◽  
Vol 42 (3) ◽  
pp. 139-145
Author(s):  
Go Takizawa ◽  
Atsushi Miki ◽  
Fumiatsu Maeda ◽  
Katsutoshi Goto ◽  
Syunsuke Araki ◽  
...  
Keyword(s):  
Visual Field ◽  
Occipital Lobe ◽  
Visual Field Defects ◽  
Field Defects

Improvement of visual field defects after focal resection for occipital lobe epilepsy: case report

2018 ◽  
Vol 128 (3) ◽  
pp. 862-866 ◽  
Author(s):  
Takahiro Yamamoto ◽  
Tadashi Hamasaki ◽  
Hideo Nakamura ◽  
Kazumichi Yamada
Keyword(s):  
Visual Cortex ◽  
Visual Field ◽  
Occipital Lobe ◽  
Neurological Deficits ◽  
Visual Field Defects ◽  
Epileptic Focus ◽  
Visual Aura ◽  
Occipital Lobe Epilepsy ◽  
The Right ◽  
Field Defects

Improvement of visual field defects after surgical treatment for occipital lobe epilepsy is rare. Here, the authors report on a 24-year-old man with a 15-year history of refractory epilepsy that developed after he had undergone an occipital craniotomy to remove a cerebellar astrocytoma at the age of 4. His seizures started with an elementary visual aura, followed by secondary generalized tonic-clonic convulsion. Perimetry revealed left-sided incomplete hemianopia, and MRI showed an old contusion in the right occipital lobe. After evaluation with ictal video-electroencephalography, electrocorticography, and mapping of the visual cortex with subdural electrodes, the patient underwent resection of the scarred tissue, including the epileptic focus at the occipital lobe. After surgery, he became seizure free and his visual field defect improved gradually. In addition, postoperative 123I-iomazenil (IMZ) SPECT showed partly normalized IMZ uptake in the visual cortex. This case is a practical example suggesting that neurological deficits attributable to the functional deficit zone can be remedied by successful focal resection.

scholarly journals Migraine-Like Positive Visual Phenomena Related to Focal Cortical Lesions with Undetectable Visual Field Defects

2021 ◽  
pp. 653-658
Author(s):  
Amir Vosoughi ◽  
Andrew Micieli ◽  
Jonathan A. Micieli
Keyword(s):  
Visual Field ◽  
Visual Fields ◽  
Occipital Lobe ◽  
Visual Disturbance ◽  
Visual Field Defects ◽  
Cortical Lesions ◽  
Visual Aura ◽  
Visual Phenomena ◽  
History Of ◽  
Field Defects

Migraines are commonly associated with a visual aura that has a characteristic clinical presentation. Cortical lesions within or in close proximity to the retrochiasmal visual pathways may also present in a manner that mimics migrainous visual phenomena and, in some cases, may be too small to manifest with a visual field defect on formal testing. We present 4 patients (3 females and 1 male) with an average age of 48.5 (range 28–67) years who had migraine-like visual disturbances related to a right temporal meningioma, occipital cavernoma, occipital lobe infarction, and demyelination in the optic radiations, which was the presenting sign of multiple sclerosis. No patient underwent neurosurgical intervention, and 1 patient (occipital lobe infarct) had complete resolution of the symptom after initial presentation. All patients had normal visual fields at follow-up and no thinning evident on optical coherence tomography. Our cases emphasize the importance of a history in assessing patients with transient positive visual phenomena and identify pathology that may present without visual field defects. Clinical features that should raise a doubt about a diagnosis of migraine visual aura include the absence of headache, brief visual disturbance lasting <5 min or those lasting >60 min, and age >40, especially with no past medical history of migraine.

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