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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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Updated: Sep 3, 2025

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

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Published on: March 10, 2021

Assessing Higher-Order Visual Processing in Cerebral Visual Impairment Using Naturalistic Virtual-Reality-Based

Claire E Manley¹, Christopher R Bennett¹, Lotfi B Merabet¹

¹The Laboratory for Visual Neuroplasticity, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA 02114, USA.

Children (Basel, Switzerland)

|July 27, 2022

Summary

Cerebral visual impairment (CVI) hinders visual search in complex scenes. New virtual reality tasks objectively show how CVI affects visual processing, even with good eyesight.

Keywords:

attention cerebral visual impairment (CVI)eye tracking higher order visual processing virtual reality visual perception visual search

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Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects

Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects

Published on: September 18, 2012

Area of Science:

Ophthalmology
Neuroscience
Human-Computer Interaction

Background:

Cerebral visual impairment (CVI) is a brain-based visual processing disorder.
Individuals with CVI struggle with visual search in cluttered environments.
Current assessment methods may not fully capture functional visual deficits.

Purpose of the Study:

To develop and validate novel virtual reality (VR)-based visual search tasks for assessing higher-order visual processing in CVI.
To objectively quantify visual search performance and gaze metrics in individuals with CVI.
To investigate the impact of task complexity on visual search abilities in CVI.

Main Methods:

Development of two VR-based visual search tasks: a static object search (virtual toybox) and a dynamic human search (virtual hallway).
Integration of eye-tracking technology to record gaze metrics during task performance.
Systematic manipulation of distractor elements to alter task demand.
Comparison of performance between individuals with CVI and age-matched controls.

Main Results:

CVI participants demonstrated significant impairments in visual search performance across both VR tasks compared to controls.
All measured gaze metrics were significantly affected in the CVI group.
A trend of declining performance with increased task complexity was observed in CVI participants.
Impaired search performance persisted even in CVI individuals with normal or near-normal visual acuity.

Conclusions:

VR-based visual search tasks with eye-tracking offer an objective method for assessing higher-order visual processing deficits in CVI.
These findings suggest that visual search difficulties in CVI are not solely due to reduced visual acuity.
The developed VR approach holds potential for clinical utility in evaluating functional visual processing challenges in CVI.