Whenever I did meth and started pissing dark red pee my eyes would become so bad at focusing I needed strong reading glasses to read my monitor.
I heard eyeballs are full of liquid and it made me wonder - are my eyes being canalised for water due to the meth induced dehydration?
P.S. I mention meth because there’s a big difference in severity between normal dehydration - which is bad - and meth-induced which is 10xTERRIBLE but less easily spotted.
I’m no doctor, but I’m told dehydration causes vision problems. As your said, eyeballs are balls of liquid. When you’re dehydrated they don’t work right.