A neuro-ocular syndrome causing blurry vision in astronauts spells bad news for longterm space travelers.
have also linked the increase in pressure inside the head from microgravity to structural changes in the shape of the eye.While their findings show that humans are able to adapt to long-term exposure to microgravity, the results of crew members from different agencies varied. For example, the increase of fluid was more prominent in NASA astronauts than their Russian counterparts.
These countermeasures include high-resistive exercise protocols, which can affect fluid redistribution in the brain. Russian cosmonauts use a technique called lower body negative pressure . The cosmonauts put their bodies in a chamber that acts like a suction cup—decreasing the pressure inside causes fluids from the upper body to shift back down into the lower body. While effective, it doesn’t mean that such a method is the answer to all their space woes.
Although it’s still not widely understood, SANS can affect up to 70 percent of all astronauts. To try to stop or slow down the condition, NASA has been making efforts to provide preventative healthcare measures to astronauts before long missions.. But ocular problems—even those with tentative solutions—will only hinder the first batch of interplanetary explorers. “That’s not a good solution if we’re planning on establishing a permanent colony on the moon, and then going on to Mars,” Roberts says.
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