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008			150908s2015 gw | s |||| 0|eng d
020			_a9783319178707
040			_aES-MaUEC
050		4	_aRC1150 _b2015 EB
082	0	4	_a617.7
100	1		_aSeedhouse, Erik _995319 _0Local
245	1	0	_aMicrogravity and Vision Impairments in Astronauts _cby Erik Seedhouse
250			_a1st ed.
260			_aCham, Switzerland _bSpringer _c2015
300			_a1 recurso en línea (XII, 96 p.) 49 il., 46 il. col.
336			_aTexto (visual) _btxt _2rdacontent
337			_aelectrónico _bc _2rdamedia
338			_arecurso electrónico _bcr _2rdacarrier
490	1		_aSpringerBriefs in Space Development _x2191-8171
520			_aRecent 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. Â{u4A25} 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 occurrenceÂ{u1BA4} resolvingÂ{u4A25} symptomsÂ{u6BF2} 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 andÂ{u9D33} possibleÂ{uFCA9}gins.
942			_2lcc _cLE
650	0	7	_aVuelos espaciales a la luna _0LocalX _2embne _9151266
856	4	0	_uhttps://go.openathens.net/redirector/universidadeuropea.es?url=https://link.springer.com/book/10.1007/978-3-319-17870-7 _zAcceso a este recurso digital (usuarios Universidad Europea de Madrid)
901			_ai9783319178707
907			_a.b12910417 _b10-10-17 _c10-02-16
988			_aSpringer_Medicine_2015
998			_am _a_alco _a_vill _b11-02-17 _cm _dz _ea _feng _ggw _h0
945			_aRC1150 .S443 2015 EB _g1 _ieBOOK _j0 _lmae _o- _pEUR0.00 _q- _r- _sb _t15 _u0 _v0 _w0 _x0 _y.i11578099 _z06-04-17
999			_c82401 _d82401 _x1