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Altering body position affects intraocular pressure and visual function.

B J Linder1, G L Trick, M L Wolf

  • 1Department of Ophthalmology, Washington University Medical Center, St. Louis, Missouri 63110.

Investigative Ophthalmology & Visual Science
|October 1, 1988
PubMed
Summary
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Head-down tilt significantly elevates intraocular pressure (IOP) and impairs neural function in the retina and visual cortex. These effects are most pronounced with sustained 6-degree head-down tilt.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Physiology

Background:

  • Intraocular pressure (IOP) is influenced by body position.
  • Previous research suggests a link between body posture and ocular health.
  • Understanding these changes is crucial for managing visual health.

Purpose of the Study:

  • To evaluate the impact of head-down tilt on intraocular pressure (IOP).
  • To assess the effects of head-down tilt on retinal and visual cortex neural function.
  • To determine the duration and angle of head-down tilt that maximize these effects.

Main Methods:

  • Two experiments were conducted on visually normal subjects with baseline IOP < 19.
  • Experiment 1: Varied whole-body tilt angles (+90 to -90 degrees) measuring IOP and biopotentials.

Related Experiment Videos

  • Experiment 2: Maintained 6-degree head-down tilt for 2 hours, with repeated IOP and biopotential measurements.

    • Main Results:

    • Significant IOP elevations (up to 3x baseline) were observed with increasing head-down tilt angles.
    • Head-down tilt induced significant reductions in neurophysiological function at both retinal and cortical levels.
    • The maximal neural effect was observed at a 6-degree head-down tilt maintained for 20 minutes.

    Conclusions:

    • Body position significantly affects intraocular pressure.
    • Head-down tilt negatively impacts retinal and visual cortex neural function.
    • Sustained head-down tilt poses a risk to visual neurophysiological function.