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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: Aug 18, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Including visual orienting functions into cerebral visual impairment screening: Reliability, variability, and

N Ben Itzhak¹, M J G Kooiker², J J M Pel³

¹Department of Development and Regeneration, University of Leuven (KU Leuven), Leuven, Belgium; Child Youth Institute (L-C&Y), Leuven, Belgium.

Research in Developmental Disabilities

|December 9, 2022

Summary

Highly salient stimuli reveal optimal visual performance in children with cerebral visual impairment (CVI). Variable visual orienting functions (VOF) with less salient stimuli highlight CVI characteristics for detection.

Keywords:

Cerebral visual impairment Remote eye tracking Test-retest reliability Visual orienting functions Visual perception

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Published on: April 11, 2025

Area of Science:

Neuroscience
Ophthalmology
Developmental Pediatrics

Background:

Cerebral visual impairment (CVI) is a complex neurological condition affecting visual processing.
It can impair basic visual orienting functions (VOF) and higher-order perception.

Purpose of the Study:

To assess the reliability and variability of an eye-tracking VOF paradigm in children with CVI.
To explore the relationship between VOF and daily visual functioning and visuoperceptual skills.

Main Methods:

Thirty-three children with CVI underwent eye tracking, visuoperceptual testing, and parent questionnaires.
Intraclass correlation coefficients and Bland-Altman plots evaluated VOF reliability and variability.
Linear mixed models analyzed relationships between VOF and clinical characteristics.

Main Results:

Highly salient stimuli demonstrated good reliability for VOF, showing less variability.
Less salient stimuli revealed greater VOF variability, correlating with younger age and specific visual impairments.
Slower reaction times were linked to visual disinterest, clutter, and distance viewing issues.

Conclusions:

Eye tracking with varying stimulus salience effectively characterizes VOF in CVI.
Highly salient stimuli identify optimal performance, while variable responses to less salient stimuli are key CVI indicators.