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[Objective assessment of senile changes in visual function by visually evoked cortical potentials].

E Adachi-Usami, M Shimotori, N Kuroda

    Nippon Ganka Gakkai Zasshi
    |December 1, 1989
    PubMed
    Summary

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    Visual function declines with age due to neuronal pathway changes, not lens issues. Studies in humans and animals show decreased visual acuity and increased P100 peak latency in the elderly.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Gerontology

    Context:

    • Aging leads to significant changes in visual perception and function.
    • Previous research often attributed age-related vision loss to crystalline lens opacities.
    • Understanding the specific mechanisms of visual senescence is crucial for targeted interventions.

    Purpose:

    • To quantitatively assess age-related changes in visual function in humans and animals.
    • To differentiate between lens-induced and neuronal pathway contributions to vision loss in the elderly.
    • To investigate the role of neurotransmitter deficiencies in age-related visual pathway dysfunction.

    Summary:

    • Pattern visually evoked cortical potentials (P-VECP) showed increased latency and decreased amplitude in the elderly.

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  • Age-related declines were observed in contrast and luminance thresholds, temporal frequency processing, and visual field sensitivity.
  • Studies on pseudo-phakic eyes and animal models indicated that neuronal pathways, not lens changes, are primarily responsible for age-related visual deficits.

    • Impact:

    • Identifies neuronal pathways as the primary site of age-related visual decline.
    • Suggests potential neurotransmitter involvement in visual processing deficits in senescence.
    • Provides a foundation for further research into neuroprotective strategies for maintaining visual health in aging populations.