Notice bibliographique
- Notice
Type(s) de contenu et mode(s) de consultation : Texte noté : électronique
Auteur(s) : Seedhouse, Erik (1964-....)
Titre(s) : Microgravity and vision impairments in astronauts [Texte électronique] / Erik Seedhouse
Publication : Cham : Springer ; [Strasbourg, France] : International Space University, [2015]
Description matérielle : 1 ressource dématérialisée
Collection : Springer briefs in space development
Note(s) : Includes bibliographical references and index
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 entry point for understanding the full scope of the problem and its possible
origins
Sujet(s) : Vision -- Effets du vol spatial
Vol spatial -- Physiologie
Apesanteur -- Effets physiologiques
Vision -- Recherche
Médecine spatiale
Troubles de la vision -- Étiologie
Spationautes
Identifiants, prix et caractéristiques : ISBN 9783319178707
Identifiant de la notice : ark:/12148/cb446795242
Notice n° :
FRBNF44679524
(notice reprise d'un réservoir extérieur)
Table des matières : Introduction ; Syndrome-specific Anatomy and Physiology ; Earth-bound Pathophysiology
of Increased Intracranial Pressure ; Pathophysiology of Increased Intracranial Pressure
in Weightlessness ; Pathology, demographics and anatomy of papilledema ; Microgravity
Induced Cephalad Fluid Shift ; The Role of Carbon Dioxide ; Advanced Resistive Exercise
Device (ARED) ; Diet on board the International Space Station.