What happens to your eyes in space?

Answer 1

In space, the lack of gravity can cause fluid to shift towards the head, leading to changes in vision for astronauts. This can result in a condition known as space-flight associated neuro-ocular syndrome (SANS), which may involve swelling of the optic nerve and altered shape of the eyeball. Many astronauts experience blurred vision and other visual disturbances during long-duration missions. These effects highlight the need for ongoing research into eye health and vision changes in microgravity environments.