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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: Jan 11, 2026

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

Published on: February 11, 2014

Head and Eye Control in Persons with Low Vision during Urban Navigation.

Mahya Beheshti^1,2, John Ross Rizzo^1,2,3,4,5,6, Sarah Bergquist-Kosumi⁷

¹Department of Rehabilitation Medicine, NYU Langone Health, New York, USA.

|November 19, 2025

Summary

Individuals with low vision may experience decoupled eye and head movements during urban navigation, especially those with peripheral field loss. This impacts their mobility and safety in complex environments.

Keywords:

Eye-Head Coupling Eye-Tracking Sensory-motor integration Visual Impairment

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Related Experiment Videos

Last Updated: Jan 11, 2026

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

Published on: February 11, 2014

Development of an Audio-based Virtual Gaming Environment to Assist with Navigation Skills in the Blind

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Published on: March 27, 2013

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:

Low vision significantly impairs daily activities, particularly urban navigation.
Adaptive strategies like head movements are used, but urban environments pose risks.
Existing research on head-eye coordination is limited by lab settings.

Purpose of the Study:

To investigate head-eye coordination during naturalistic urban navigation in individuals with low vision.
To compare movement patterns between low-vision participants and a control group.
To test the hypothesis of eye-head decoupling in visual impairment.

Main Methods:

A naturalistic "free-head" experiment using eye-tracking technology.
Comparison of participants with low vision (peripheral, central, acuity loss) and controls.
Analysis of head and eye movement patterns during urban navigation.

Main Results:

Individuals with peripheral field loss showed significant eye-head decoupling.
Those with acuity loss demonstrated more synchronized eye and head movements.
Distinct movement patterns were observed in central field loss, though results were inconclusive.

Conclusions:

Eye-head decoupling is a key finding in peripheral low vision, impacting navigation.
Findings inform rehabilitation strategies and assistive technologies for low vision.
Research advances understanding of mobility challenges and solutions for urban environments.