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Some visual effects caused by the beverage kava.

L F Garner, J D Klinger

    Journal of Ethnopharmacology
    |July 1, 1985
    PubMed
    Summary
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    Kava consumption, a traditional South Pacific beverage, was studied for its effects on vision. The drink impaired near vision functions like accommodation and convergence, and affected eye muscle balance.

    Area of Science:

    • Ophthalmology
    • Pharmacology
    • Neuroscience

    Background:

    • Kava (Piper methysticum) is a culturally significant beverage in the South Pacific.
    • Its psychoactive properties are well-documented, but its specific effects on visual function are less understood.

    Purpose of the Study:

    • To investigate the impact of kava consumption on various visual parameters in a single subject.
    • To identify potential ocular side effects associated with kava intake.

    Main Methods:

    • Visual functions were assessed in one participant after consuming kava.
    • Measurements included accommodation, convergence, pupil diameter, oculomotor balance, visual acuity, and stereoacuity.

    Main Results:

    • A reduction in the near point of accommodation and convergence was observed.

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  • Increased pupil diameter and disturbances in oculomotor balance were noted.
  • No significant changes were found in visual acuity, stereoacuity, or refractive error.

    • Conclusions:

    • Kava consumption can transiently affect specific visual functions, particularly those related to near vision and eye coordination.
    • These findings suggest potential implications for activities requiring precise visual control after kava intake.