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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
Prosopagnosia01:24

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
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A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...
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Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.

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Related Experiment Video

Updated: Jul 17, 2026

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Perimetric homonymous visual field loss post-stroke.

Bradley Scott Townend1, Jonathan William Sturm, Con Petsoglou

  • 1Neurology Department, Gosford Hospital, Gosford 2250, NSW, Australia. towser7@hotmail.com

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
|February 3, 2007
PubMed
Summary

Post-stroke visual field loss affects driving ability. Formal perimetry testing is crucial as confrontational methods and patient awareness often underestimate the prevalence of this condition.

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Area of Science:

  • Neurology
  • Ophthalmology
  • Rehabilitation Medicine

Background:

  • Post-stroke homonymous visual field (PSHVF) loss presents significant challenges for patient function and driving.
  • Accurate assessment of PSHVF loss is vital for determining driving eligibility and patient safety.

Purpose of the Study:

  • To evaluate the prevalence of PSHVF loss in stroke survivors at 9 months post-stroke.
  • To compare the effectiveness of automated perimetric testing versus confrontational methods (NIHSS) in detecting PSHVF loss.
  • To assess patient awareness of visual field deficits and their driving status.

Main Methods:

  • Sixty-one stroke admissions were assessed at 9 months post-stroke.
  • Visual fields were evaluated using Humphrey Visual Field Analyser II (perimetry) and NIHSS confrontational testing.
  • Driving status and awareness of visual deficits were recorded.

Main Results:

  • 16% of patients had PSHVF loss (hemianopia or quadrantanopia), with right-sided loss being more common.
  • No patients were aware of their visual field loss.
  • Confrontational NIHSS testing detected only 20% of actual PSHVF losses, significantly underestimating the condition.
  • 30% of patients with significant PSHVF loss were still driving at 9 months.

Conclusions:

  • The prevalence of PSHVF loss is substantial and frequently underestimated by standard clinical assessments.
  • Stroke patients often lack awareness of their visual field deficits, posing a risk to themselves and others while driving.
  • Formal perimetric testing is recommended for accurate PSHVF assessment to guide decisions on driving eligibility post-stroke.