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Scientists have developed a hi-tech sleeping bag that could prevent the vision problems that some astronauts experience while living in space.

In zero-gravity, fluids float into the head and squash the eyeball over time.

It's regarded as one of the riskiest medical problems affecting astronauts, with some experts concerned it could compromise missions to Mars.

The sleeping bag sucks fluid out of the head and towards the feet, countering the pressure build-up.

Its development was led by Dr Benjamin Levine, professor of internal medicine at University of Texas (UT) Southwestern Medical Center in Dallas, who is working on having the device deployed on the International Space Station (ISS).

(Picture: the sleeping bag developed to prevent the squashed eyeball condition some astronauts experience. Credit: UT Southwestern Medicine Center)