Anton’s syndrome: a rare and unusual form of blindness

Chaudhry, Faisal Bashir; Raza, S.; Ahmad, Usman

doi:10.1136/bcr-2018-228103

Cited by 12 publications

(9 citation statements)

References 24 publications

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“…The patient in this study was unaware of the visual field defects in daily life, regardless of the homonymous hemianopia established in the Goldmann perimetry. This discrepancy might be attributed to anosognosia, as observed in Anton syndrome ( 16 – 19 ). Anton syndrome occurs, usually when the cortical damage is bilateral, but it may occur after hemilateral damages ( 18 ), as in this case.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…When the occipital lobes, including the visual cortex, are impaired, the patient could be unaware of the visual defect in rare cases (16)(17)(18)(19). The mechanism of this condition, known as Anton syndrome, is not well-known, and it is more likely to occur when bilateral occipital lobes are impaired (18,19). In homonymous hemianopia, the visual field opposite to the hemilateral cortical damage is impaired, but the visual defect is sometimes compensated by eye movements (20)(21)(22).…”

Section: Introductionmentioning

confidence: 99%

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Visual Field Test With Gaze Check Tasks: Application in a Homonymous Hemianopic Patient Unaware of the Visual Defects

Shibuki

Yokota²,

Hirasawa³

et al. 2021

Front. Neurol.

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Gaze control is required for applying visual stimuli to a particular area of the visual field. We developed a visual field test with gaze check tasks to investigate hemianopia. In this test, participants must report the presence or absence of visual stimuli when a small object at the fixation point vibrates. Trials in the absence of visual stimuli were used as gaze check tasks, since the vibration could be observed only when the gaze was directed at the fixation point. We evaluated the efficacy of our test in four control participants and one patient with homonymous hemianopia who was unaware of the defects in the left visual field. This patient presented hemianopia in the test with gaze check tasks, but not when the gaze check tasks were omitted. The patient showed spontaneous gaze movements from the fixation point to the upper left direction, as well as scanning of the left visual field during the test without gaze check tasks. Thus, we concluded that the visual defects in this patient were compensated in daily life by spontaneous eye movements coordinated with visual information processing. The present results show the usefulness of the visual field test with gaze check tasks.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Visual Field Test With Gaze Check Tasks: Application in a Homonymous Hemianopic Patient Unaware of the Visual Defects

Shibuki

Yokota²,

Hirasawa³

et al. 2021

Front. Neurol.

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“…Interestingly, injury to the occipital lobe appears to cause problems in object recognition such as in Anton syndrome, a disorder called cortical blindness where, while preserving intact peripheral environmental vision, subjects are unable to recognize objects [ 64 ].…”

Section: Discussionmentioning

confidence: 99%

Approximate Entropy of Brain Network in the Study of Hemispheric Differences

Alù¹,

Miraglia²,

Orticoni³

et al. 2020

Entropy

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Human brain, a dynamic complex system, can be studied with different approaches, including linear and nonlinear ones. One of the nonlinear approaches widely used in electroencephalographic (EEG) analyses is the entropy, the measurement of disorder in a system. The present study investigates brain networks applying approximate entropy (ApEn) measure for assessing the hemispheric EEG differences; reproducibility and stability of ApEn data across separate recording sessions were evaluated. Twenty healthy adult volunteers were submitted to eyes-closed resting EEG recordings, for 80 recordings. Significant differences in the occipital region, with higher values of entropy in the left hemisphere than in the right one, show that the hemispheres become active with different intensities according to the performed function. Besides, the present methodology proved to be reproducible and stable, when carried out on relatively brief EEG epochs but also at a 1-week distance in a group of 36 subjects. Nonlinear approaches represent an interesting probe to study the dynamics of brain networks. ApEn technique might provide more insight into the pathophysiological processes underlying age-related brain disconnection as well as for monitoring the impact of pharmacological and rehabilitation treatments.

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“…These symptoms include meningitis, encephalitis, flaccid paralysis, and myoclonus, among others [2]. Anton-Babinski syndrome, also known as Anton syndrome, is cortical blindness resulting from a lesion of the bilateral occipital lobes [3]. Here we describe a unique case of neuroinvasive WNV encephalitis from the United States that presented with fever, acute encephalopathy, and Anton syndrome.…”

Section: Introductionmentioning

confidence: 92%

Neuroinvasive West Nile Virus (WNV) Encephalitis With Anton Syndrome: Epidemiology and Pathophysiology Review

Srichawla¹

2022

Cureus

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The West Nile virus (WNV) belongs to the genus of flaviviruses and is known to cause irreversible neurologic deficits. Neuroinvasive WNV cases continue to be rare and have a higher prevalence in South America, Africa, and Asia. Here we report a 55-year-old female from North America who presented with acute-onset encephalopathy, fever, myalgias, and Anton syndrome. Neuroradiographic findings included diffuse white matter abnormalities of both cortical and subcortical structures and the patient was diagnosed with posterior reversible encephalopathy syndrome (PRES). Further workup revealed WNV antibodies in both cerebrospinal fluid (CSF) and serum. Management of WNV encephalitis continues to be poor and thus the patient was referred to a long-term care facility. Furthermore, Anton syndrome is a rare focal neurologic deficit that has never been previously associated with the WNV. This case aims to highlight the epidemiology of WNV in the United States, the mechanisms of WNV encephalitis, and an overview of Anton syndrome.

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Anton’s syndrome: a rare and unusual form of blindness

Cited by 12 publications

References 24 publications

Visual Field Test With Gaze Check Tasks: Application in a Homonymous Hemianopic Patient Unaware of the Visual Defects

Visual Field Test With Gaze Check Tasks: Application in a Homonymous Hemianopic Patient Unaware of the Visual Defects

Approximate Entropy of Brain Network in the Study of Hemispheric Differences

Neuroinvasive West Nile Virus (WNV) Encephalitis With Anton Syndrome: Epidemiology and Pathophysiology Review

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