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Visual dysfunction in Alzheimer's disease: relation to normal aging.

A Cronin-Golomb1, S Corkin, J F Rizzo

  • 1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge.

Annals of Neurology
|January 1, 1991
PubMed
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Alzheimer's disease (AD) patients exhibit significant visual impairments, including color vision and contrast sensitivity deficits. These visual dysfunctions likely stem from brain pathology, not retinal or optic nerve issues.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Gerontology

Background:

  • Alzheimer's disease (AD) is a neurodegenerative disorder impacting cognitive functions.
  • Visual system changes in AD are not fully understood, with potential implications for diagnosis and patient care.

Purpose of the Study:

  • To comprehensively assess visual functions in patients with Alzheimer's disease (AD).
  • To compare visual performance in AD patients with age-matched and young healthy controls.
  • To investigate the relationship between visual deficits and AD severity, and their potential origin.

Main Methods:

  • Evaluated color vision, stereoacuity, contrast sensitivity, backward masking, and critical flicker fusion thresholds.
  • Compared AD patients (n=[specify number if available]) with age-matched and young healthy control groups.

Related Experiment Videos

  • Conducted detailed neuro-ophthalmological examinations on a subset of AD patients.

    • Main Results:

    • AD patients showed significant deficits in color vision (predominantly blue axis), stereoacuity, contrast sensitivity, and backward masking compared to controls.
    • Critical flicker fusion thresholds were normal in AD patients relative to age-matched controls.
    • Contrast sensitivity loss in AD occurred across frequencies, with greater impairment at low spatial frequencies, unlike normal aging patterns.

    Conclusions:

    • Widespread visual dysfunction in Alzheimer's disease (AD) is evident, affecting multiple visual processing areas.
    • Deficits in color and stereoacuity are independent of dementia severity, suggesting modular visual system involvement.
    • The findings support the hypothesis that visual impairments in AD are primarily due to central nervous system pathology (visual and association cortex) rather than peripheral ocular issues.