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Transient pattern visual evoked potentials in children with Down's syndrome.

Catherine M Suttle1, Anne M Turner

  • 1School of Optometry and Vision Science, University of New South Wales, Sydney, NSW 2052, Australia. c.suttle@unsw.edu.au

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|March 10, 2004
PubMed
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Children with Down's syndrome have lower visual acuity, potentially due to abnormal retino-cortical processing. Transient visual evoked potentials (VEPs) revealed differences in visual processing, suggesting a specific cortical abnormality.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Genetics

Background:

  • Children with Down's syndrome exhibit reduced visual acuity and contrast sensitivity compared to typically developing children.
  • While ocular abnormalities contribute, persistent visual deficits suggest underlying retino-cortical processing issues.

Purpose of the Study:

  • To investigate retino-cortical visual processing in children with Down's syndrome.
  • To assess visual function by recording transient visual evoked potentials (VEPs).

Main Methods:

  • Transient visual evoked potentials (VEPs) were recorded in response to pattern stimuli.
  • VEP responses from children with Down's syndrome were compared to those from typically developing children.

Main Results:

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  • Response latency was similar between the two groups.
  • VEP morphology differed, with a diminished or undetectable N75 component in children with Down's syndrome.

Conclusions:

  • Findings suggest a specific cortical abnormality affecting the N75 component of pattern-reversal achromatic VEPs in Down's syndrome.
  • Abnormal retino-cortical processing contributes to visual dysfunction in children with Down's syndrome.