NASA has noticed for some time that astronauts are
returning from six month stays on the International Space Station
with blurred vision as other problems with eyesight
A new study using the brain scans of 27 astronauts
who have been in space for over a month on a single mission have
shown eyeball, nerve and gland abnormalities like people
intracranial hypertension. Given the fact that intracranial
hypertension results from internal skull pressure it could be a side
affect of blood pooling in the head during space flight.
If this problem does not stabilize after six months it could be a
problem for flight to mars and space tourism. At the vary least it
would make artificial gravity a must.
Long Missions May Wreck