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Related Concept Videos

Visual Agnosia01:12

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 end"...

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Three Dimensional Vestibular Ocular Reflex Testing Using a Six Degrees of Freedom Motion Platform
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Visual fixation in Chiari type II malformation.

Michael S Salman1, James A Sharpe, Linda Lillakas

  • 1Section of Pediatric Neurology, Children's Hospital, University of Manitoba, Winnipeg, Manitoba, Canada. msalman@ hsc.mb.ca

Journal of Child Neurology
|February 3, 2009
PubMed
Summary

Chiari type II malformation does not appear to cause abnormal eye movements like square wave jerks. This congenital hindbrain deformity may allow for stable visual fixation despite its effects.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Developmental Biology

Background:

  • Chiari type II malformation is a congenital hindbrain deformity.
  • Square wave jerks are involuntary saccades affecting visual fixation.
  • Cerebellar disorders can cause square wave jerks and saccadic oscillations.

Purpose of the Study:

  • To investigate the effects of Chiari type II malformation on visual fixation.
  • To determine if Chiari type II malformation is associated with pathological square wave jerks or saccadic oscillations.

Main Methods:

  • Eye movements were recorded using an eye tracker in 21 participants (aged 8-19) with Chiari type II malformation.
  • Data was compared to 38 age-matched healthy controls.
  • Square wave jerk parameters and saccadic oscillations were analyzed.

Main Results:

  • Square wave jerk parameters were similar between participants with Chiari type II malformation and controls.
  • No saccadic oscillations were observed in either group.
  • Chiari type II malformation was not associated with pathological square wave jerks or abnormal saccadic oscillations.

Conclusions:

  • Chiari type II malformation does not appear to be associated with pathological square wave jerks or saccadic oscillations.
  • Stable visual fixation may be preserved due to compensatory mechanisms or sparing of cerebellar regions.
  • Further research is needed to fully understand the neurovisual implications of this condition.