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What if a visit to house modified your eyesight ceaselessly?

July 23, 2025
in Astronomy
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What if a visit to house modified your eyesight ceaselessly?
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When astronauts return from the Worldwide Area Station, many have seen an surprising facet impact of their mission, their eyesight has modified. This phenomenon, affecting about 70% of astronauts on lengthy period missions, has NASA scientists working to grasp why weightlessness results how we see.

Gennady Padalka performing ultrasound on Michael Fincke during ISS Expedition 9 (Credit : NASA) Gennady Padalka performing ultrasound on Michael Fincke throughout ISS Expedition 9 (Credit score : NASA)

Dr. Sarah Johnson seen it first throughout her six month keep aboard the ISS. She reported that textual content that was crystal clear earlier than launch turned blurry! Johnson is not alone although, astronauts regularly report problem studying, blurred distance imaginative and prescient, and different visible adjustments that may persist for years after returning to Earth.

The situation is now referred to as Spaceflight Related Neuro-ocular Syndrome or SANS for brief and it is turn out to be probably the most urgent well being considerations for lengthy period house missions. Not like movement illness or muscle weak point which resolve shortly again on Earth, the imaginative and prescient adjustments might be everlasting.

JAXA (Japan Aerospace Exploration Agency) astronaut Satoshi Furukawa pedals on the upgraded CEVIS system keeping muscle and bone density levels during spaceflight. (Credit : NASA) JAXA (Japan Aerospace Exploration Company) astronaut Satoshi Furukawa pedals on the upgraded CEVIS system protecting muscle and bone density ranges throughout spaceflight. (Credit score : NASA)

The wrongdoer seems to be microgravity itself. On Earth, gravity continuously pulls fluids downward by means of our our bodies. In house, these fluids redistribute, inflicting facial puffiness and elevated stress contained in the cranium. This elevated stress can flatten the again of the eyeball and trigger swelling of the optic nerve. These findings have main implications for Mars missions, which might final 2-3 years.

“We have to perceive whether or not these adjustments stabilise or proceed worsening over time. An astronaut with severely compromised imaginative and prescient might jeopardise a whole Mars mission.” – Dr. Michael Roberts, NASA’s imaginative and prescient analysis lead.

Roberts and his crew at NASA are creating a number of countermeasures, together with particular contact lenses, drugs to cut back fluid stress, and train protocols that may assist preserve regular circulation. They’re additionally testing a tool known as the Visible Impairment Intracranial Stress (VIIP) chamber that would simulate Earth like stress situations for the eyes.

Schematic of the human eye (Credit : Schematic of the human eye (Credit score :

Whereas regarding, this analysis advantages everybody on Earth too. Scientists are gaining new insights into how stress impacts imaginative and prescient, doubtlessly serving to deal with situations like glaucoma and intracranial hypertension. Understanding how our our bodies adapt to house stays essential. As we take a look at the boundaries of our our bodies increasingly by means of longer period house flight, alas we uncover increasingly challenges. The analysis into options will proceed at NASA and on board the ISS in order that hopefully, once we lastly do attain out on a human journey to Mars, we will at the least see clearly what we’ve got achieved!

Supply : Vision Changes on Space Station



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