Got a call from Nana this afternoon. It seems she woke up blind in one eye entirely and needs to go see a specialist at the hospital. Given that she's well into her 80s and has had glaucoma for a very, very long time, it's probably just a progression of the disease. All the same, best to get these things checked.
It's only one eye at least, so she can still do the crossword in the mornings.