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Blurred vision is one of the symptoms of space sickness

Space sickness was a condition caused by being off of a planet's surface. Its symptoms included nausea, dizziness, and disorientation.

Space sickness was often brought on by turbulence on a ship, or inertial dampeners being out of alignment, and was especially strong if a ship lacked artificial gravity. In many ways, space sickness was the deep space equivalent to sea sickness. Just as an experienced sailor was said to have "sea legs", experienced space travelers were said to have "space legs". (ENT: "Sleeping Dogs", "The Xindi", TOS: "The Lights of Zetar") Nonetheless, most space travelers experienced space sickness from time to time. Space sickness could be treated by inaprovaline. (VOY: "Relativity")

In the 23rd century, in the medical history section of Christopher Pike's personnel file, space sickness was listed with other ailments he had suffered during his lifetime prior to 2257. (DIS: "Brother")

In 2267, Pavel Chekov joked to Hikaru Sulu that frequent course changes between Vulcan and Altair VI were making him space-sick. (TOS: "Amok Time")

In 2269, Montgomery Scott misinterpreted Mira Romaine's telepathic connection with the Zetarians as space sickness. (TOS: "The Lights of Zetar")

Worf was known to suffer from nausea when in zero gravity. (Star Trek: First Contact)

Tom Paris claimed to be prone to space sickness after being brainwashed by the Quarren. (VOY: "Workforce")

In 2374, B'Elanna Torres, while floating in space with Tom Paris, told him that the experience of being in space with EV suits was nothing like the simulations at Starfleet Academy and it made her feel a little sick to her stomach. (VOY: "Day of Honor")

Ezri Dax suffered from this condition after being joined to her symbiont, but refused to give in to the condition so she could find and save Worf. (DS9: "Shadows and Symbols", "Penumbra")

Doctor Julian Bashir handed Ezri Dax twenty milligrams of a medicine in a hypospray when she boarded the runabout to Sappora VII and told her it should help her with her space sickness. (DS9: "Prodigal Daughter")

In 2375, a number of USS Voyager crew members reported symptoms of space sickness, which were found to be the result of temporal distortions produced by a temporal disruptor. (VOY: "Relativity")

According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 17), one of these crew members was Ensign Manis. This character was not mentioned in the episode.

Tuvok suffered from space sickness while the ship traveled through a neutronic wave front in 2376. (VOY: "Fair Haven")

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