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Related Experiment Videos

Sympathetic pupillary tone in old age

A D Korczyn, N Laor, P Nemet

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |November 1, 1976
    PubMed
    Summary

    Pupillary responses to ocular sympathetic agents reveal decreased sympathetic tone in elderly individuals. The dilator pupillae muscle maintains its sensitivity to norepinephrine with aging.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Gerontology

    Background:

    • Senile miosis, or age-related pupil constriction, may involve autonomic neural factors.
    • Understanding age-related changes in the autonomic nervous system is crucial for geriatric health.

    Purpose of the Study:

    • To investigate the role of autonomic neural factors in senile miosis.
    • To compare pupillary responses to sympathetic agents in young and elderly adults.

    Main Methods:

    • Pupillary responses were measured in elderly and young adult subjects.
    • Agents acting on the ocular sympathetic system were administered.
    • Sensitivity of the dilator pupillae muscle to norepinephrine was assessed.

    Main Results:

    • Sympathetic tone appears to be decreased in the elderly population.
    • The dilator pupillae muscle's sensitivity to norepinephrine remains unchanged with age.

    Conclusions:

    • Autonomic neural factors, specifically reduced sympathetic tone, likely contribute to senile miosis.
    • Age does not diminish the sensitivity of the iris dilator muscle to direct adrenergic stimulation.

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