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June 1987

Optic Nerve Dysfunction During Gravity Inversion: Visual Field Abnormalities

Author Affiliations

From the Department of Ophthalmology, University of Texas Health Science Center, Dallas (Dr Sanborn); University of Pittsburgh Eye and Ear Infirmary (Dr Friberg); and Department of Ophthalmology, University of Virginia Medical Center, Charlottesville (Dr Allen).

Arch Ophthalmol. 1987;105(6):774-776. doi:10.1001/archopht.1987.01060060060033

• Inversion in a head-down position (gravity inversion) results in an intraocular pressure of 35 to 40 mm Hg in normal subjects. We used computerized static perimetry to measure the visual fields of normal subjects during gravity inversion. There were no visual field changes in the central 6° of the visual field compared with the baseline (preinversion) values. However, when the central 30° of the visual field was tested, reversible visual field defects were found in 11 of 19 eyes. We believe that the substantial elevation of intraocular pressure during gravity inversion may pose potential risks to the eyes, and we recommend that inversion for extended periods of time be avoided.

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