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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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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...

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Related Experiment Video

Updated: Dec 29, 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

Checkerboard Visual Field Defect in Occipital Stroke.

Sarah Kamal¹, Bayan A Al Othman, Ashwini T Kini

¹McGovern Medical School (SK), Houston, Texas; Department of Ophthalmology (BAAO, ATK, AGL), Blanton Eye Institute, Houston Methodist Hospital, Houston, Texas; Departments of Ophthalmology, Neurology, and Neurosurgery (AGL), Weill Cornell Medicine, New York, New York; Department of Ophthalmology (AGL), University of Texas Medical Branch, Galveston, Texas; University of Texas MD Anderson Cancer Center (AGL), Houston, Texas; Department of Ophthalmology (AGL), Texas A and M College of Medicine, Bryan, Texas; and Department of Ophthalmology (AGL), The University of Iowa Hospitals and Clinics, Iowa City, Iowa.

Journal of Neuro-Ophthalmology : the Official Journal of the North American Neuro-Ophthalmology Society

|February 7, 2020

Summary

This summary is machine-generated.

A patient experienced peripheral vision loss due to brain bleeding. A subsequent stroke caused a rare checkerboard visual field defect, indicating bilateral occipital lobe damage.

Area of Science:

Neuroscience
Ophthalmology
Neurology

Background:

Intracranial hemorrhage can lead to significant neurological deficits.

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Visual field defects, such as homonymous hemianopsia, are common after occipital lobe injury.

Bilateral occipital lobe lesions can result in complex and rare visual field abnormalities.