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Related Concept Videos

Photoreceptors and Visual Pathways01:22

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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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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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
Visual System01:26

Visual System

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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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[Disorders of visual perception].

S Schuett1, J Zihl

  • 1Institut für Angewandte Psychologie, Universität Wien, Liebiggasse 5, 1010 Wien, Österreich. susanne.schuett@univie.ac.at

Der Nervenarzt
|August 11, 2012
PubMed
Summary
This summary is machine-generated.

Visual perception disorders are common after brain injury, impacting diagnosis and treatment. Compensatory rehabilitation strategies are recommended for their effectiveness and cost-efficiency.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Context:

  • Acquired brain injury frequently causes visual perception disorders (20-40%).
  • These disorders complicate the assessment, diagnosis, and treatment of other functional impairments.
  • Common issues include visual field deficits, acuity/contrast sensitivity loss, and impaired recognition.

Purpose:

  • To highlight the prevalence and impact of visual perception disorders post-brain injury.
  • To emphasize the importance of accurate diagnosis and tailored rehabilitation.
  • To advocate for compensatory treatment methods.

Summary:

  • Visual perception disorders are significant consequences of acquired brain injury.
  • Frequent types include visual field deficits, acuity issues, and recognition problems.
  • Combined visual and cognitive impairments are prevalent.

Impact:

  • Accurate differential diagnosis of cerebral visual disorders is crucial.
  • Individualized rehabilitation approaches are essential for patient recovery.
  • Compensatory treatment offers effective, ecologically valid, and cost-beneficial solutions.