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Visual dysfunction, neurodegenerative diseases, and aging.

Gregory R Jackson1, Cynthia Owsley

  • 1Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, 700 South 18th Street, Suite 609, Birmingham, AL 35294-0009, USA. jackson@eyes.uab.edu

Neurologic Clinics
|September 19, 2003
PubMed
Summary
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Aging eyes face vision loss from common diseases like cataracts and glaucoma, and even without disease, visual processing declines. Parkinson

Area of Science:

  • Ophthalmology and Neuroscience
  • Geriatric Vision Science

Background:

  • Common sight-threatening conditions in older adults include cataracts, age-related macular degeneration (ARM), glaucoma, and diabetic retinopathy, impacting quality of life.
  • Aging itself causes visual perceptual problems due to optical changes and neural pathway degeneration, affecting acuity, contrast sensitivity, and processing speed.
  • Neurodegenerative diseases like Parkinson's disease (PD) and Alzheimer's disease (AD) significantly impact the visual system.

Purpose of the Study:

  • To explore the multifaceted visual impairments experienced by older adults, encompassing both common eye diseases and age-related changes.
  • To detail the specific visual system dysfunctions associated with Parkinson's disease (PD) and Alzheimer's disease (AD).
  • To highlight the clinical manifestations and electrophysiological changes in the visual pathways affected by these neurodegenerative conditions.

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Main Methods:

  • Review of literature on age-related visual decline, common ocular pathologies, and visual system involvement in PD and AD.
  • Analysis of the pathological mechanisms, including dopaminergic cell loss in PD and cortical changes in AD, affecting visual function.
  • Examination of electrophysiological findings, such as visual evoked potentials (VEPs), and their correlation with cognitive and visual deficits.

Main Results:

  • PD is linked to retinal dopaminergic cell loss, causing specific spatial-temporal visual processing abnormalities.
  • AD affects visual cortical areas, leading to delayed VEPs and deficits in higher-order visual abilities like attention, memory, and perception.
  • A visual variant of AD exists where visual problems are the primary presenting symptoms; sensory impairments may reflect cortical rather than optic nerve issues.

Conclusions:

  • Older adults experience a range of visual impairments from common diseases, aging, and neurodegeneration.
  • PD and AD present distinct visual system pathologies, affecting retinal function and cortical processing respectively.
  • Understanding these diverse visual challenges is crucial for diagnosis, management, and improving the quality of life for aging populations.