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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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Related Experiment Video

Updated: Jan 9, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

841

Using continuous visual stimulus tracking for detecting visual function loss due to acquired brain injury.

A C L Vrijling1,2, M J de Boer1, R J Renken3

  • 1Laboratory of Experimental Ophthalmology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.

Acta Ophthalmologica
|December 6, 2025
PubMed
Summary
This summary is machine-generated.

SONDA-based eye movement perimetry (SONDA-EMP) effectively detects visual field loss in acquired brain injury (ABI) patients. This new method quantifies visual function loss and shows no learning effect.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Medical Technology

Background:

  • Acquired brain injury (ABI) can lead to homonymous visual field (VF) defects.
  • Standard automated perimetry (SAP) is the gold standard for VF assessment but can be challenging for ABI patients.
  • SONDA (Standardised Oculomotor and Neurological Disorders Assessment) offers a simplified perimetric task by tracking a moving stimulus.

Purpose of the Study:

  • To evaluate if SONDA-based eye movement perimetry (SONDA-EMP) can detect visual function loss in patients with homonymous VF defects.
  • To determine if SONDA-EMP can quantify visual function loss, correlating with SAP Mean Sensitivity (MS).
  • To assess for a learning effect in SONDA-EMP performance.

Main Methods:

  • Tracking performance was assessed in 16 unilateral ABI patients and compared to 36 controls.
  • Participants monocularly tracked a moving stimulus (Goldmann size III) at three Weber contrasts (40%, 160%, 640%) while eye movements were recorded.
  • SONDA-EMP measured the agreement between gaze and stimulus position.

Main Results:

  • ABI patients showed significantly decreased tracking performance compared to controls across all contrasts (p < 0.0001).
  • Tracking performance improved from 40% to 160% contrast (p < 0.0001) but not further.
  • SAP MS showed moderate to strong correlations with tracking performance at 160% and 640% contrast (r=0.73, p=0.01; r=0.67, p=0.004).

Conclusions:

  • SONDA-EMP is capable of detecting visual function loss resulting from ABI.
  • The degree of tracking performance reduction in SONDA-EMP is dependent on the extent of visual field loss.
  • No significant learning effect was observed with repeated SONDA-EMP testing.