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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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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...
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Prosopagnosia01:24

Prosopagnosia

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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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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Updated: Nov 8, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Characteristic Visual Field Defect From Lateral Geniculate Body Stroke.

Mina M Naguib1, Matthew B Woodland, Rod Foroozan

  • 1Department of Ophthalmology, Baylor College of Medicine, Houston, Texas.

Journal of Neuro-Ophthalmology : the Official Journal of the North American Neuro-Ophthalmology Society
|April 19, 2021
PubMed
Summary
This summary is machine-generated.

A stroke affecting the left lateral geniculate body caused a right homonymous hemianopia in a hypertensive patient. Visual field changes confirmed the lesion, highlighting the importance of this brain region in vision.

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Area of Science:

  • Neuro-ophthalmology
  • Neurology
  • Stroke research

Background:

  • The lateral geniculate body (LGB) is a crucial relay center for visual information in the thalamus.
  • Lesions in the LGB can lead to specific visual field deficits.
  • Hypertension is a significant risk factor for cerebrovascular events, including stroke.

Observation:

  • A 58-year-old male presented with right-sided visual field loss and hypertensive emergency.
  • Clinical examination identified a right homonymous hemianopia.
  • Computed tomography confirmed an acute stroke in the left lateral geniculate body.

Findings:

  • The patient's visual field defect was consistent with a left lateral geniculate body lesion.
  • Automated perimetry, performed months later, revealed characteristic visual field changes.
  • The case illustrates a direct correlation between LGB infarction and homonymous hemianopia.

Implications:

  • This case underscores the LGB's critical role in visual processing and pathway integrity.
  • Understanding LGB lesions is vital for accurate diagnosis and management of visual field defects.
  • Reviewing LGB anatomy, pathophysiology, and etiologies aids in clinical practice and research.