But exactly how? I need to some research.
One of the few time I saw my dad cry was the moon landing. We went to see Apollo 11 parade in Chicago.
Find space travel interesting and since I do eye stuff for a living, this gets me curious.
How: from memory: there is mention of a part of the eye becoming stretched due to weightlessness - you’d have to read the article I referenced and others I no longer have marked on the subject.
OT
Have you read “The Crystal Sun”? It is a fascinating bit of research on lenses. For instance: the best lenses made 3500 BC were not equaled in quality until 1900 AD. Most lenses made in antiquity are labeled jewelry by archeologists as “everyone knows” that eye glasses and telescopes were relatively modern discoveries. Get the hard back (British edition) since it has all the appendices where the history of some groups or particular lens is discussed of the thousands known to exist. Many illustrations.