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Spatial vision deficits in infants and children with Down syndrome

Ffion M John1, Nathan R Bromham, J Margaret Woodhouse

  • 1School of Optometry and Vision Sciences, Cardiff University, Cardiff, Wales, United Kingdom.

Investigative Ophthalmology & Visual Science
|April 28, 2004
PubMed

Insights

Children with Down syndrome have significantly reduced visual acuity and contrast sensitivity. Objective visual-evoked potential (VEP) tests confirm a sensory deficit in the visual system of individuals with Down syndrome.

Area of Science:

  • Ophthalmology
  • Genetics
  • Developmental Neuroscience

Background:

  • Individuals with Down syndrome often exhibit visual impairments.
  • Conventional behavioral tests may be influenced by cognitive factors, potentially masking true sensory deficits.

Purpose of the Study:

  • To compare objective visual-evoked potential (VEP) measurements with behavioral tests in children with Down syndrome.
  • To determine if visual sensory deficits persist in Down syndrome when cognitive demands are minimized.

Main Methods:

  • Compared visual acuity and contrast sensitivity using VEPs and behavioral techniques in 58 children with Down syndrome and 44 controls (aged 3 months to 14.15 years).
  • Analyzed group differences using ANCOVA with age as a covariate.

Main Results:

  • Children with Down syndrome showed significantly lower visual acuity and contrast sensitivity compared to controls via both VEP and behavioral measures (P < 0.01).
  • These deficits remained significant even after excluding children with ophthalmic anomalies.

Conclusions:

  • Reduced visual acuity and contrast sensitivity in Down syndrome indicate an underlying sensory deficit within the visual system.
  • VEP testing provides objective evidence of visual system impairment in Down syndrome, independent of behavioral response mechanisms.
Abstract

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