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Related Concept Videos

Depth Perception and Spatial Vision01:15

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
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Related Experiment Video

Updated: Jun 1, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Perimetry and visual psychophysics.

Michael Wall1, Edward Linton1

  • 1Departments of Ophthalmology and Neurology, University of Iowa, Iowa City, IA, United States.

Handbook of Clinical Neurology
|May 30, 2026
PubMed
Summary
This summary is machine-generated.

Visual field testing, or perimetry, maps vision loss patterns to pinpoint neurologic damage. Understanding these patterns aids in diagnosing conditions affecting the visual system and brain.

Keywords:
Perimeterhemianopiaperimetryvisual fieldvisual field defects

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Clinical Neurology

Background:

  • Visual field defects are critical indicators for localizing neurological damage within the sensory visual system.
  • Different patterns of visual loss correspond to specific anatomical locations, from the optic nerve to the occipital cortex.

Purpose of the Study:

  • To elucidate the relationship between visual field defect patterns and the anatomic localization of lesions.
  • To provide a comprehensive overview of perimetric testing, its interpretation, and its application in neurologic diagnosis.

Main Methods:

  • Discussion of various perimetric testing methodologies and their psychophysical underpinnings.
  • Analysis of visual field patterns associated with lesions at different points in the visual pathway (prechiasmal, optic chiasm, optic tract, occipital cortex).
  • Review of relevant visual system anatomy and interpretation of perimetric results for localization.

Main Results:

  • Monocular visual defects indicate prechiasmal damage.
  • Bitemporal hemianopia is characteristic of optic chiasm lesions.
  • Incongruous homonymous hemianopia suggests optic tract damage, with increasing congruity indicating more posterior lesions approaching the occipital cortex.

Conclusions:

  • Recognizing specific visual field loss patterns is essential for accurate neurologic localization.
  • Perimetry is a valuable clinical tool for quantifying visual function and diagnosing visual pathway disorders.
  • Systematic interpretation of perimetric data, combined with anatomical knowledge, enhances diagnostic capabilities.