A new study reveals that 70% of astronauts who have spent six to 12 months on the International Space Station (ISS) experience significant vision changes due to a condition called 'spaceflight-associated neuroocular syndrome' (SANS). SANS involves symptoms like swelling of the optic nerve, flattening at the back of the eye, and general vision changes. Researchers analyzed three key eye measurements before and after spaceflight, revealing a decrease in ocular rigidity, intraocular pressure, and ocular pulse amplitude. These changes are linked to symptoms like decreased eye size, changes in focal field, and swelling of the optic nerve. The study suggests that these changes in eye mechanics could serve as biomarkers to predict the development of SANS.
Jam packed issues filled with the latest cutting-edge research, technology and theories delivered in an entertaining and visually stunning way, aiming to educate and inspire readers of all agesNASA astronaut Karen Nyberg images her eye with a fundoscope aboard the International Space Station during the Expedition 37 mission in 2013.
"Several theories have been suggested such as hemodynamic fluid shift, exposure to CO2 and exercise in microgravity conditions," the science team, led by Santiago Costantino at the Université de Montréal, wrote in the new study.
They measured ocular rigidity using a special imaging technique to get clearer pictures of the choroid, which is the layer of blood vessels in the eye. For the other two measurements, they used tonometry, a common tool to check the pressure inside the eye.
SPACEFLIGHT ASTRONAUTS VISION CHANGES SANS SPACE MEDICINE
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