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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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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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,...
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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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Cerebral Hemispheres01:05

Cerebral Hemispheres

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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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Cerebral Visual Loss.

Jason J S Barton1

  • 1Department of Medicine (Neurology), Ophthalmology and Visual Sciences, Psychology, University of British Columbia, Vancouver, Canada.

Annals of Indian Academy of Neurology
|January 2, 2023
PubMed
Summary
This summary is machine-generated.

Cerebral visual disorders impact vision at low, intermediate, and high processing levels, affecting areas like object recognition and spatial processing. Treatment often involves adaptive strategies due to the complexity of these neurological conditions.

Keywords:
Agnosiabalinthemianopia

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Cerebral visual disorders encompass a spectrum of common and rare visual processing deficits.
  • These deficits can be categorized by their impact on low-, intermediate-, and high-level visual functions.

Purpose of the Study:

  • To categorize and describe the range of cerebral visual disorders.
  • To outline the anatomical basis and clinical manifestations of these disorders.
  • To discuss the challenges and current approaches in treating cerebral visual disorders.

Main Methods:

  • Review and synthesis of existing literature on cerebral visual disorders.
  • Classification of deficits based on visual processing levels (low, intermediate, high).
  • Correlation of specific lesion locations (occipitotemporal, occipitoparietal) with distinct visual deficits.

Main Results:

  • Low-level deficits include homonymous hemifield scotomata.
  • Intermediate-level deficits involve impaired color or motion perception.
  • High-level deficits are associated with ventral stream (object recognition, prosopagnosia, pure alexia) or dorsal stream (Bálint syndrome, visuospatial impairments) lesions.

Conclusions:

  • Cerebral visual disorders present with diverse symptoms depending on the affected visual processing level and brain region.
  • Anatomical proximity leads to clustering of deficits into recognizable cerebral visual syndromes.
  • Current treatment predominantly relies on compensatory strategies rather than direct restoration of visual function.