What Can Be Done to Help Astronaut Vision in Space? universetoday storybywill
As Prof. Morgan explained in a recent UWA, human bodies have evolved to counter the effects of gravity by pushing blood upwards into the head:
“In microgravity, this can lead to an increased average pressure in the cerebrospinal fluid, which adversely affects the retina and deteriorates vision and other important functions. The strength of the pulsations in the tiny veins of the retina should, in principle, depend on the cerebrospinal fluid pressure. All blood vessels experience tiny pulsations coming from the heartbeat.”
Until recently, intracranial pressure could only be measured through a lumbar puncture, a skull burr hole, or other invasive measures that are painful, risky, and difficult to perform in microgravity. For their study, Morgan and his associates used a special eye camera to measure tiny pulsation changes in subjects placed in different positions on a tilt table.
According to co-author Danail Obreschkow, an Associate Professor with the International Centre for Radio Astronomy Research and the Director of the International Space Centre, their team has developed the first non-invasive method for measuring cerebrospinal fluid pressure changes that can be performed safely in space. These results study could be crucial to overcoming a type of blindness that frequently develops in astronauts on long-duration space flights.
“The so-called Space Associated Neuro-ocular Syndrome is one of the most serious risks for astronauts on long-duration flights and one that NASA identified as a significant challenge on future crewed missions to Mars.
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