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Visual Agnosia

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...

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Related Experiment Video

Updated: Oct 27, 2025

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

Visual field improvement in neglect after virtual reality intervention: a single-case study.

Michael Christian Leitner^1,2, Stefan Hawelka^1,2

¹Centre for Cognitive Neuroscience (CCNS), University of Salzburg, Salzburg, Austria.

|July 19, 2021

Summary

This study shows that a patient with visuo-spatial neglect experienced significant visual field expansion using a new Virtual Reality (VR) system. This VR-based restorative intervention improved visual field functionality.

Keywords:

Neglect neuropsychology rehabilitation stroke virtual reality visual field defect

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Last Updated: Oct 27, 2025

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults

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Published on: February 12, 2020

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

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

Published on: April 11, 2025

Area of Science:

Neuroscience
Ophthalmology
Rehabilitation Medicine

Background:

Visuo-spatial neglect is a challenging condition often resulting from visual field loss.
Restorative approaches are being explored to improve visual field functionality in affected patients.

Purpose of the Study:

To investigate the effectiveness of a novel Virtual Reality (VR) system for treating visuo-spatial neglect.
To assess the impact of a VR-based restorative intervention on visual field expansion and functionality.

Main Methods:

A single patient with visuo-spatial neglect underwent training with the "Salzburg Visual Field Trainer" VR system for 254 days.
Visual field changes were measured using perimetry, and subjective improvements were assessed via self-report.

Main Results:

Perimetric results demonstrated a visual field expansion of 48.8% in the left eye and 36.8% in the right eye.
This corresponds to an approximate visual angle improvement from 5.5° to 10.5°.
Subjective self-reports indicated functional improvements of up to 317% in visual field functionality.

Conclusions:

The study suggests that VR-based restorative interventions can be beneficial for patients with visuo-spatial neglect.
The "Salzburg Visual Field Trainer" shows promise as a tool for visual field rehabilitation.