What happens to your eyes in space?

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.