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Optic nerve dysfunction during gravity inversion. Visual field abnormalities.

G E Sanborn, T R Friberg, R Allen

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |June 1, 1987
    PubMed
    Summary
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    Gravity inversion significantly raises intraocular pressure. While central vision remains unaffected, extended inversion may cause reversible visual field defects, posing potential eye risks.

    Area of Science:

    • Ophthalmology
    • Physiology

    Background:

    • Gravity inversion, or head-down positioning, leads to a marked increase in intraocular pressure (IOP) in healthy individuals.
    • Elevated IOP is a known risk factor for various ocular conditions.

    Purpose of the Study:

    • To investigate the impact of gravity inversion on visual field integrity in normal subjects.
    • To assess potential risks associated with elevated intraocular pressure during inversion.

    Main Methods:

    • Computerized static perimetry was employed to measure visual fields.
    • Visual fields were assessed in normal subjects during a state of gravity inversion.
    • Baseline (preinversion) visual field data was compared to data obtained during inversion.

    Main Results:

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    • No changes were observed in the central 6 degrees of the visual field.
    • Reversible visual field defects were detected in 11 out of 19 eyes when testing the central 30 degrees.
    • A significant elevation of intraocular pressure (35-40 mm Hg) was confirmed during inversion.

    Conclusions:

    • Substantial intraocular pressure elevation during gravity inversion may present risks to ocular health.
    • Extended periods of gravity inversion should be approached with caution and potentially avoided.