Similar effects, which can lead to problems with vision, have been observed in
non-space travellers who suffer from unexplained pressure build-up in the
brain, a condition known as intracranial hypertension.
“Microgravity-induced intracranial hypertension represents a hypothetical
risk factor and a potential limitation to long-duration space travel,”
said lead author Larry Kramer, professor of diagnostic and interventional
imaging at The University of Texas Medical School at Houston.
“The MRI findings revealed various combinations of abnormalities
following both short- and long-term cumulative exposure to microgravity also
seen with idiopathic intracranial hypertension.”
While bone loss and temporary muscular aches and nerve abnormalities have been
known to afflict astronauts in the past, the new data on eye problems has
many at NASA concerned about the health of its space flight corps.
“NASA has placed this problem high on its list of human risks, has
initiated a comprehensive program to study its mechanisms and implications,
and will continue to closely monitor the situation,” said William
Tarver, chief of the flight medicine clinic at NASA’s Johnson Space Center.
He said the findings are suspicious but not conclusive of intracranial
hypertension, and said no astronauts have been rendered ineligible for
future space flight as a result of the findings.
Source: AFP
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