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Vision in aging and dementia

C J Bassi1, K Solomon, D Young

  • 1School of Optometry, University of Missouri-St. Louis.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|October 1, 1993
PubMed
Summary
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Alzheimer's disease (AD) patients exhibit distinct visual deficits, including impaired contrast sensitivity, which are specific to the condition beyond normal aging or other dementias.

Area of Science:

  • Ophthalmology
  • Neurology
  • Gerontology

Background:

  • Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
  • Visual impairments are increasingly recognized as potential early indicators of AD.
  • Understanding visual changes in AD is crucial for differential diagnosis and patient care.

Purpose of the Study:

  • To quantify visual deficits in Alzheimer's disease (AD) patients.
  • To compare visual changes in AD with those in normal aging and other dementia types.
  • To identify visual impairments specific to Alzheimer's disease.

Main Methods:

  • Study included four groups: probable AD patients (N=10), other dementia patients (N=10), age-matched controls (N=11), and young controls (N=10).
  • Visual functions assessed included color vision (L'Anthony D-15 desaturated color test), contrast sensitivity (Pelli-Robson chart), and stereoacuity (RAN-DOT test).

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Main Results:

  • Alzheimer's disease patients showed age-related deficits in color vision and deficits in stereoacuity similar to other dementias.
  • A specific deficit in low spatial frequency contrast sensitivity was identified in AD patients.
  • Visual changes in AD encompass age-related, other dementia-related, and AD-specific alterations.

Conclusions:

  • Alzheimer's disease patients experience a range of visual impairments.
  • Contrast sensitivity deficits, particularly at low spatial frequencies, appear to be specific to Alzheimer's disease.
  • These findings highlight the potential of contrast sensitivity testing for diagnosing AD.