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There is a serious side effect to going to space, NASA says
A new study from NASA, conducted over several years of long-duration spaceflights on the International Space Station, has found that more than half of U.S. astronauts started noticing changes in their vision after more than six months aboard the ISS. Here's what to know. Article content What does the study say? Article content Article content 'Many found that, as their mission progressed, they needed stronger reading glasses,' the study says. 'Researchers studying this phenomenon identified swelling in the optic disc, which is where the optic nerve enters the retina, and flattening of the eye shape.' Article content Article content What is causing it? Article content A Canadian-led study with an even longer acronym — Space Flight-Associated Neuro-ocular Syndrome Ocular Rigidity Investigation, or SANSORI — was carried out to determine whether stiffness of the eye, called ocular rigidity, contributes to development of SANS. Article content It studied 26 eyes (or 13 crew members) that spent between 157 and 186 days on the ISS, and revealed a drop in ocular rigidity (33 per cent), intraocular pressure (11 per cent) and ocular pulse amplitude (25 per cent) following the missions. 'These findings reveal previously unknown effects of microgravity on the eye's mechanical properties, contributing to a deeper understanding of … SANS,' researchers wrote. 'Long-term space missions significantly alter ocular biomechanics and have the potential to become biomarkers of disease progression.' Article content Article content What kinds of treatment have been tried? Article content Article content NASA has a study taking place now on the space station with a device called the Thigh Cuff. The ongoing investigation has 10 astronauts using tight leg cuffs to change the way fluid moves around inside the body, especially around the eyes and in the heart and blood vessels. Article content That study is expected to wrap up next year but, if successful, the team behind the device says, 'the cuffs could serve as a countermeasure against the problems associated with fluid shifts, including SANS.' Article content They add: 'A simple and easy-to-use tool to counter the headward shift of body fluids could help protect astronauts on future missions to the Moon and Mars. The cuffs also could treat conditions on Earth that cause fluid to build up in the head or upper body, such as long-term bed rest and certain diseases.' Article content Other possible treatments have been considered. Last year, a paper was published about an unnamed female astronaut with a particularly severe case of SANS. Her condition improved after she started taking a prescribed B-vitamin supplement that was flown to her on the station; however, there was coincidentally a reduction in cabin carbon dioxide at the same time, so researchers weren't certain if that may have also helped.
