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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Visual Agnosia01:12

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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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Related Experiment Video

Updated: Jul 12, 2025

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping
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Glaucoma-associated abnormalities in cortical activity during a visuocognitive task.

Clémentine Garric1, Yannick Wamain2, Jean-François Rouland3

  • 1Univ. Lille, INSERM, CHU Lille, U1172 - LilNCog - Lille Neuroscience and Cognition, F-59000 Lille, France.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|October 22, 2023
PubMed
Summary
This summary is machine-generated.

Glaucoma patients show delayed visual processing and altered cognitive brain dynamics. Early visual processing was 50ms slower, with compensatory mechanisms observed in higher-level cognitive tasks.

Keywords:
CognitionEEGGlaucomaPlasticityVision Loss

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Background:

  • Glaucoma, a leading cause of irreversible blindness, affects optic nerve health.
  • Visual processing and cognitive functions may be impacted in glaucoma patients.

Purpose of the Study:

  • To investigate neurophysiological dynamics during a visuocognitive task in glaucoma patients compared to healthy controls.
  • To explore potential cognitive compensation mechanisms in early-stage primary open-angle glaucoma (POAG).

Main Methods:

  • Utilized electroencephalography (EEG) to monitor brain activity during a go/no-go visual object categorization task.
  • Compared 15 early-stage POAG patients with 15 age-matched healthy controls.

Main Results:

  • POAG patients exhibited a 50ms delay in early visual processing.
  • Cognitive processing showed reduced differentiation between stimuli in POAG patients.
  • Behavioral data revealed differences in accuracy and decision criteria between groups.

Conclusions:

  • POAG is associated with delayed early visual processing.
  • Evidence suggests potential high-level cognitive compensation in late, task-dependent brain activations in POAG patients.