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Self-tonometry under microgravity conditions

J Draeger1, R Schwartz, S Groenhoff

  • 1Abteilung für Ophthalmologie, Universitäts-Krankenhaus Eppendorf, Hamburg.

The Clinical Investigator
|September 1, 1993
PubMed
Summary
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Astronauts experienced a significant 92% increase in intraocular pressure shortly after entering microgravity. This initial rise in eye pressure then adapted over several hours during the space mission.

Area of Science:

  • Ophthalmology
  • Space Medicine
  • Physiology

Background:

  • Space missions involve microgravity, which causes fluid shifts in the body.
  • Fluid shifts can affect intraocular pressure (IOP), the pressure inside the eye.
  • Understanding early IOP changes is crucial for astronaut health.

Purpose of the Study:

  • To analyze early changes in intraocular pressure during a space mission.
  • To investigate the effect of microgravity-induced fluid shifts on IOP.
  • To establish baseline IOP data for astronauts in microgravity.

Main Methods:

  • Utilized an automatic self-tonometer for precise IOP measurements.
  • Obtained 13 IOP readings per eye during the space mission.
  • Compared in-flight IOP data with daytime-correlated baseline data from Earth.

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Main Results:

  • A 92% rise in intraocular pressure was observed 16 minutes after reaching microgravity.
  • An adaptation phase for IOP occurred over several hours post-entry into microgravity.
  • Diurnal IOP profiles showed no significant differences in altitude or amplitude during the mission.

Conclusions:

  • Microgravity causes a rapid and substantial increase in intraocular pressure.
  • The eye pressure adapts over time during spaceflight.
  • Further research is needed to understand long-term IOP effects in space.