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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...

Vision

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

Association Areas of the Cortex

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...

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Related Experiment Video

Updated: Apr 3, 2026

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients

Published on: April 14, 2014

Visual Field Testing: The Key to Localizing Afferent Visual Pathway Lesions.

Fiona Costello¹

¹Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada; Department of Surgery (Ophthalmology), University of Calgary, Calgary, Alberta, Canada.

Neurologic Clinics

|April 1, 2026

Summary

This summary is machine-generated.

Visual field testing is crucial for examining the afferent visual pathway. Patterns of visual field loss help localize neurological conditions and monitor disease progression with various testing techniques.

Keywords:

Afferent visual pathway Anatomic topography Goldmann perimetry Humphrey perimetry Structure-function relationships

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Area of Science:

Ophthalmology
Neurology
Neuroscience

Background:

Visual field testing is fundamental for assessing the afferent visual pathway.
Patterns of visual field loss are key indicators for localizing neurological conditions.
Techniques range from bedside confrontation tests to formal perimetry.

Purpose of the Study:

To review diverse visual field-testing methodologies.
To explore structure-function relationships within the afferent visual pathway.
To present an approach for utilizing visual fields in neurologic diagnosis localization.

Main Methods:

Review of established visual field-testing techniques.
Discussion of neuroanatomy and visual pathway structure-function correlations.
Case examples illustrating diagnostic localization using visual field data.

Main Results:

Different visual field tests offer varying levels of diagnostic information.
Specific patterns of visual field defects correlate with distinct neurological lesions.
Standard automated perimetry quantifies functional impact of structural pathology.

Conclusions:

Visual field testing is indispensable for neurological assessment.
Understanding structure-function relationships enhances diagnostic accuracy.
Visual field analysis provides a systematic method for localizing neurologic diagnoses.