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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"...
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Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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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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Related Experiment Video

Updated: May 12, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
07:45

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Unusual chiasmal visual field defects.

Jae Hyoung Kim1, Chae-Yong Kim, Hee Kyung Yang

  • 1Department of Radiology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.

Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology
|April 9, 2013
PubMed
Summary
This summary is machine-generated.

Unusual visual field defects, like monocular quadrantanopia, can result from infrachiasmal compression. High-resolution MRI is crucial for diagnosing these rare conditions caused by masses near the optic chiasm.

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Area of Science:

  • Ophthalmology
  • Neurology
  • Radiology

Background:

  • Optic chiasm compression typically causes superiorly denser visual field defects.
  • Infrachiasmal masses can lead to various visual field abnormalities.

Observation:

  • Two rare cases of visual field defects due to infrachiasmal compression are presented.
  • Case 1: Monocular inferotemporal quadrantanopia. Case 2: Monocular temporal and inferonasal field defect.

Findings:

  • These rare defects are hypothesized to result from compression between the mass and the anterior cerebral artery.
  • High-resolution (≤3 mm) coronal T2-weighted MRI is essential for visualizing the detailed anatomy of the compressed optic chiasm.

Implications:

  • Routine brain MRI with larger section thickness may miss subtle findings.
  • Clinicians must consider compression between masses and anterior cerebral arteries as a cause of unusual visual field defects.
  • Meticulous review of high-resolution MRI is vital for accurate diagnosis and understanding the etiology of these visual field defects.