Speaking of the heavy weapons of the big country, we have to say that our Shenzhou THIRTEEN, the sword points to the sky, who competes with the front, this time we challenged the space station a number of firsts, but also opened the longest plan for our astronauts to spend in orbit.
In particular, the high-profile space trio, including China's first female space teacher Wang Yaping, interacts with everyone through live television every day and lives in space for up to six months, in fact, everyone is most concerned about the health of the three astronauts.
Because environmental factors in space are very complex, they can have a complex impact on the astronaut's body.
Video clip released by CCTV: Astronaut Eye Examination
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80% of astronauts return to Earth · Nearsighted?
NASA has released a study showing that 7 astronauts who completed a 6-month space mission had a change in vision.
NASA studies have shown that 7 astronauts had 20/20 perfect vision before entering space, but after returning to Earth, 6 had vision regression, and 5 of them had flattening of the back of the eyeball.
NASA calls this phenomenon "impaired intracranial pressure syndrome" and believes that in addition to the increase intracranial pressure due to gravity changes, there may be other comprehensive factors that cause changes in astronauts' vision, such as neurological changes, biochemical changes, and lymphatic and venous circulatory disorders.
Astronauts are short-sighted, what to do?
In 2009, NASA approved astronauts to undergo all-laser laser laser surgery. Previously, NASA had banned astronauts from performing refractive surgery.
Dr. Stenven Schallhorn is the head of refractive surgery in the U.S. Navy and a consultant to nasa before retiring from the U.S. Military. Dr. Shallhorn presented the results of a study in which 100 military personnel underwent refractive surgery at the 2006 escrs conference. In this one test, 95 percent of people had vision of 20/20 or better.
In another study of 370 naval personnel, more patients had at least 20/16 naked-eye vision after femtosecond laser surgery, results that were reported at the AAO Conference in 2006.
Today, NASA has approved astronaut candidates to undergo LSSik surgery, which includes pilots, missile experts, and more. Applicants must have optimal corrected vision of 20/20 or above in at least one year of surgery.
After myopia, do you want to do the same thing as an astronaut?
Laser surgery in China is also becoming more and more popular and recognized, including joining the military (except for special services), a variety of professional vision requirements, can be met by refractive surgery to meet the standard. Many people opt for laser surgery and get rid of the shackles of glasses.
There are many kinds of myopia surgery, smrt full laser, half femtosecond, full femtosecond, icl crystal surgery and so on. Many people ask, then I want to be an astronaut, but in fact, there is no real sense of "best".
How to interpret the preoperative report is a very important test for doctors. How to interpret the preoperative report, capture potential hazards, and design the surgical plan depends on the doctor's experience and control of the whole eye.
The rule of long-term care after myopia surgery
Practical 20-20-20 rule
The most basic and practical method of eye protection is suitable for everyone - after 20 minutes of close eye use, look 20 yards away (about 6 meters) and look away for 20 seconds.
Avoid staring at the screen for long periods of time
Under normal circumstances, people blink every 2 to 6 seconds, that is, an average of 18 blinks per minute, which can promote tear secretion, lubricate the cornea and conjunctiva, and protect the eyes.
But when we look intently at the screen, because the flicker of the screen will make us blink less often. In the long run, the more serious the problem of dry eyes.
Gently massage around the eyes
A gentle eye massage can relieve fatigue, but don't rub your eyes with your hands! Because the bacteria on the hands are easy to cause eye inflammation, and even cause corneal morphology changes, forming astigmatism.