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Astronauts can develop space-associated neuroocular syndrome (SANS) during long spaceflights. Lower body negative pressure shows promise in counteracting SANS, crucial for future space exploration.

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Area of Science:

  • Space medicine
  • Ophthalmology
  • Human physiology in space

Background:

  • Prolonged spaceflight causes headward fluid shifts, impacting astronaut ocular health.
  • Space-associated neuroocular syndrome (SANS) is a growing concern for astronauts.

Purpose of the Study:

  • To review the symptoms, causes, and potential countermeasures for SANS.
  • To highlight the importance of understanding and preventing SANS for future space missions.

Main Methods:

  • Review of existing literature on SANS.
  • Analysis of physiological changes associated with microgravity.
  • Evaluation of proposed countermeasures.

Main Results:

  • SANS is characterized by optic disc edema, choroidal thickening, cotton wool spots, and hyperopic shift.
  • Likely causes include altered hemodynamics, elevated intracranial/intraocular pressure, and spacecraft environmental factors.
  • Lower body negative pressure, thigh cuffs, spacecraft engineering, and artificial gravity are potential countermeasures.

Conclusions:

  • Prolonged space missions carry risks of SANS, impacting vision.
  • Lower body negative pressure is a promising countermeasure for headward fluid shifts.
  • Preventing SANS is critical for long-duration missions to the Moon and Mars.