“Spaceflight-associated neuro-ocular syndrome (SANS) is a collection of eye and brain changes caused by spending prolonged periods in a low-gravity environment, and it impacts around 70 percent of astronauts on the International Space Station, according to NASA. One of the starkest cases is that of NASA astronaut John Phillips, who launched to the ISS (e.i. : he went up into orbit in a space station) in 2005 with 20/20 vision, and splashed down (e.i. : he returned back to the Earth) six months later with his vision at 20/100 - - what’s considered a moderate visual impairment. While he was in space, bodily fluid, uninhibited by gravity, built up in his head, squashing his eyeballs, swelling his optic nerve, and pushing his retina forward.”

“Where we’re going, we won’t need eyes to see.”

There’s loose and speeding electrons up there. A subatomic soup from all the explosions that came before us and continue until gravity or mass stops them.

Atomic particles speed through you (and damage your eyes) when you’re on a ship or space station rotating around earth that fast.

Often the vessel you’re in gets peppered with subatomic holes. Your eyes are particularly prone to this damage as they’re designed to be sensitive to particles/waves on those scales. Space is not safe.

Now THATS a spicy meatball!