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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...
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

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.
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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Related Experiment Video

Updated: Jun 24, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Visual perceptual consequences of stroke.

Fiona Rowe1,

  • 1Directorate of Orthoptics and Vision Science, University of Liverpool, Liverpool, UK. rowef@liverpool.ac.uk

Strabismus
|March 21, 2009
PubMed
Summary
This summary is machine-generated.

Stroke survivors frequently experience visual impairments, with nearly all referred patients showing some deficit. Perceptual issues like inattention and cortical visual processing impairment affect one-fifth of stroke patients.

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Area of Science:

  • Neurology
  • Ophthalmology
  • Neuroscience

Background:

  • Stroke can lead to significant visual impairments, including agnosia, alexia, dyschromatopsia, inattention, and hallucinations.
  • Evaluating the prevalence of these perceptual consequences is crucial for understanding the full impact of stroke on patients.

Purpose of the Study:

  • To determine the prevalence of perceptual consequences following stroke.
  • To assess various visual deficits experienced by stroke patients.

Main Methods:

  • A prospective multicenter cohort trial (Vision in Stroke [VIS] group) collected data from 14 centers over one year.
  • Standardized protocols assessed visual acuity, ocular motility, visual fields, visual inattention, and visual cognition/perception in 323 stroke patients.

Main Results:

  • Of 323 recruited patients, 92% had visual impairment; 20.5% experienced perceptual difficulties.
  • Specific perceptual issues included inattention (14.2%), hallucinations (2.5%), and agnosia (2.2%).
  • Eye movement impairment (68.4%) and visual field impairment (46.1%) were also common.

Conclusions:

  • A significant majority of stroke patients referred for visual assessment exhibit visual impairment.
  • Perceptual consequences, particularly inattention and cortical visual processing deficits, affect a substantial portion of stroke survivors.