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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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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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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Related Experiment Video

Updated: Nov 9, 2025

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

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Perimetry and visual field defects.

Michael Wall1

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

Handbook of Clinical Neurology
|April 9, 2021
PubMed
Summary
This summary is machine-generated.

Perimetry quantifies the visual field using light stimuli to detect vision loss patterns. Understanding these patterns aids neurologists in diagnosing visual pathway damage and localizing lesions.

Keywords:
HemianopiaPerimeterPerimetryVisual fieldVisual field defects

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Area of Science:

  • Ophthalmology
  • Neurology
  • Neuroscience

Background:

  • Perimetry is essential for quantifying visual field defects.
  • Visual field testing maps vision loss caused by sensory visual system damage.
  • Accurate interpretation of perimetry is crucial for clinical diagnosis.

Purpose of the Study:

  • To discuss types of perimetric testing and psychophysics.
  • To explain the interpretation of perimetric results and relevant visual system anatomy.
  • To review patterns of visual loss for neurologic localization.

Main Methods:

  • Review of perimetric testing methodologies.
  • Analysis of visual field patterns and their correlation with neuroanatomy.
  • Discussion of psychophysical principles underlying visual field testing.

Main Results:

  • Strictly monocular defects indicate prechiasmal sensory visual system damage.
  • Bitemporal hemianopia is characteristic of optic chiasm lesions.
  • Homonymous hemianopia congruity increases with lesion proximity to the occipital cortex.

Conclusions:

  • Visual field patterns are key to anatomic diagnosis of visual pathway lesions.
  • Understanding perimetry aids neurologists in localizing neurologic damage.
  • Systematic analysis of visual field defects enhances diagnostic accuracy.