I have read this thread with interest as my 95 year old mum has cataracts in both eyes. Sometimes she says she can't read the subtitles on TV (she has hearing aids), but other times she reads the subtitles out loud. So I'm thinking it's a processing problem as to whether she can/can't read subtitles at any given moment. Mum also has glasses which she often doesn't wear as she says she can see ok. I'd suggested a few years ago that mum have a cataract operation but the waiting list was around 7 months and mum didn't seem particularly bothered. I have felt guilty at not pursuing it, thinking it might give her a better quality of life, but after reading this thread, I don't think the operation would benefit her. Thank you everyone for posting your experiences and information.
I have exactly the same! some days she can read fine and then others she can't. I did wonder if it was her glasses but this "processing" thing makes sense. She fronts so well that it's hard to tell anything is wrong. I am so new on this journey that I didn't realise it was a recognised thing.