Microgravity and Vision Impairments in Astronauts - Seedhouse, Erik
38,99 €
inkl. MwSt.
Versandkostenfrei*
Versandfertig in 6-10 Tagen
payback
19 °P sammeln
  • Broschiertes Buch

Recent missions on board the International Space Station have revealed previously unreported physiological consequences of long duration space flight, particularly in eyesight, and in this Brief Dr. Seedhouse reviews the existing theories on what causes this degeneration and how long it will last. Notably, 60% of long-duration crews have reported subjective degradation in vision, a clear indication that further study is necessary before astronauts embark on even longer-term space missions. Decreased near-visual acuity was reported in 46% of ISS/Mir crewmembers, resulting in a change of up to 2…mehr

Andere Kunden interessierten sich auch für
Produktbeschreibung
Recent missions on board the International Space Station have revealed previously unreported physiological consequences of long duration space flight, particularly in eyesight, and in this Brief Dr. Seedhouse reviews the existing theories on what causes this degeneration and how long it will last. Notably, 60% of long-duration crews have reported subjective degradation in vision, a clear indication that further study is necessary before astronauts embark on even longer-term space missions. Decreased near-visual acuity was reported in 46% of ISS/Mir crewmembers, resulting in a change of up to 2 dioptres in their refractive correction. It is possible that ophthalmic changes have been present since the first days of spaceflight, but had been attributed to other causes; this approach to the issue as well as other hypotheses are all presented in full to give a broad foundation of the existing knowledge on the topic. The changes have occurred at various times during a mission with varying degrees of visual degradation. Some cases resolved on return to Earth, but several crewmembers have not regained pre-flight visual acuity, indicating the damage may be permanent. One explanation of the syndrome has been attributed to hyperopic shift due to aging, but onboard analysis techniques, including visual acuity assessments, retinal imagery, and ultrasound examination of the eye, has led to the acceptance of a wider syndrome. In addition to vision changes, studies have reported flattening of the globe, swelling of the optic disc (papilledema), choroidal folds in the retina, swelling of the optic nerve sheath, and visual field defects. It is widely hypothesized that this spectrum of symptoms may be explained by an elevation of intracranial pressure (ICP). Establishing the provenance of this medical problem, monitoring its occurrence and resolving the symptoms for future long term space missions is a key challenge for space medicine. With this book, readers have an entrypoint for understanding the full scope of the problem and its possible origins.
Autorenporträt
Erik Seedhouse works as an assistant professor (Applied Aviation Sciences and Aerospace and Occupational Safety) at Embry-Riddle Aeronautical University, Daytona Beach, where he teaches Human Factors in Aviation (SF 320) in addition to courses in the Commercial Space Operations curriculum. He is also the Manager of the Suborbital Spaceflight Simulator, Mission Control Center. Between 2008 and 2013, he was director of Canada's manned centrifuge operations and managed the hypobaric facility at DRDC Toronto. He is a Fellow of the British Interplanetary Society, a member of the Space Medical Association, and member of the Suborbital Technical Committee. In 2009, he was one of the final 30 candidates in the Canadian Space Agency's Astronaut Recruitment Campaign. Erik is the Co-Editor-in-Chief for the Handbook of Life Support Systems for Spacecraft and a published author with more than 25 books to his name, including two textbooks for the International Space University.