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Related Concept Videos

Vision01:24

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.

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Related Experiment Video

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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
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When do asymmetrical full-field pattern reversal visual evoked potentials indicate visual pathway dysfunction in

Tessa B Mellow1, Alki Liasis, Ruth Lyons

  • 1Clinical and Academic Department of Ophthalmology, Great Ormond Street Hospital for Children, London, UK.

Documenta Ophthalmologica. Advances in Ophthalmology
|November 4, 2010
PubMed
Summary

Half-field pattern reversal visual evoked potentials (pVEPs) can clarify full-field asymmetries in children. This testing is valuable for diagnosing visual pathway dysfunction when full-field results are unclear.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Pediatric Vision

Background:

  • Visual evoked potentials (VEPs) assess the visual pathway's integrity.
  • Transoccipital asymmetries in pattern reversal VEPs (pVEPs) can indicate visual dysfunction.
  • Understanding these asymmetries in children is crucial for diagnosis.

Purpose of the Study:

  • To investigate the association between full-field and half-field pVEP transoccipital asymmetries in children.
  • To determine if half-field pVEP distributions can explain observed full-field asymmetries.

Main Methods:

  • Monocular full-field and half-field pVEPs were recorded in 46 children.
  • Electrodes were placed at Oz, O1, and O2, referenced to Fz.
  • Data were analyzed to categorize asymmetry and assess half-field contributions.

Main Results:

  • 17% of patients had symmetrical full-field pVEPs; four of these showed half-field deficits.
  • Among 38 patients with asymmetrical full-field pVEPs, 44% exhibited a half-field deficit.
  • 53% showed symmetrical half-field responses despite full-field asymmetry.

Conclusions:

  • Half-field pVEPs are effective in explaining full-field pVEP asymmetries in pediatric patients.
  • This method should be considered for children with suspected visual pathway dysfunction who can cooperate.
  • Half-field pVEP testing aids in the detailed assessment of visual pathway integrity in children.