Going into Space Crushes the Delicate Nerves in Your Eyeballs
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[It is fascinating how dangerous space is, especially when you spend a lot of time in space. It seems to me there are many problems we whites will have to solve, but given our incredible creativity we will solve all these problems. Space is the exciting frontier which can allow the white race to live FOREVER if we can leave the Earth. Then we can live for as long as the universe exists, which will be much longer than the life span of our planet. Space excites me. Only whites will be capable of solving these very complex engineering and medical problems. Jan]
Two delicate, bundled stalks of nerve tissue erupt forward from the brain, slip between gaps in the backs of each eyeball, and attach themselves gently to the rear of each retina. These are the optic nerves, the transmitters linking human beings to their powers of sight. And now researchers have shown that space travel puts a powerful, dangerous squeeze on their fragile tips.
A study of 15 astronauts who had been on missions in orbital freefall for about six months found that the tissues at the backs of their eyes — tissues that surround the heads of their optic nerves — tended to look warped and swollen in the weeks after their return to Earth. This change could help explain why nearly half of long-term space travelers develop significant vision problems, according to the study, published today (Jan. 11) in the journal JAMA Ophthalmology.
This isn’t the first study to demonstrate that space travel changes the shape of the eye; a 2011 paper published in the journal Ophthalmology showed that there were changes to the internal anatomies of astronauts’ eyes. But the new study is the first to show direct, damaging changes to the optic nerve.
Credit: Dr. John B. Selhorst/Wikimedia commons, CC-BY-SA 4.0
That’s a big deal, because as NASA slowly (ever so slowly) works toward long-term crewed missions into deep space, it needs to understand how those missions are likely to impact astronauts’ health.
Many of the 15 astronauts in the study had pre-existing eye damage (likely from previous missions) before the trips to space documented in this study. But images of their Bruch membrane openings — the gaps in the back of the eye through which the optic nerve travels — showed those tissues moving deeper into the eye after long-term missions and swelling significantly after the astronauts returned to Earth.
It’s not clear exactly why this happens, but the researchers offered a guess: Perhaps the internal pressure in the eye increases while the astronauts are up in space, and over time, the surrounding tissues get used to that new pressure. Then, upon return to Earth’s gravity, that pressure might quickly drain away. The rapid change could irritate and deform the eye’s internal tissues.
The researchers don’t offer a solution to this problem, and it’s not clear that it’s a problem within NASA’s capacity to solve. But it’s an issue the human spaceflight program will have to think about carefully as it asks its workforce to endure longer and longer stints in outer space.
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