Why do astronauts suffer from vision problems?

[Vision20]

Anomalies of the retina, the light-sensitive area at the back of the eye Abnormalities of the nerves that carry visual signals from the eye to the brain (the optic nerve and optic pathways) Light must travel through several transparent structures before it can be vision 20/20 meaning detected by the retina. It first passes through the cornea (the clear layer at the front of the iris and pupil), then through the lens, and then through the vitreous (the jelly-like substance that fills the eyeball).

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