Optic nerve dysfunction during gravity inversion. Visual field abnormalities
G. E. Sanborn, T. R. Friberg and R. Allen
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 degrees of the visual field compared with the baseline
(preinversion) values. However, when the central 30 degrees 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.
