As more and more bits of me start to fall off or just go wrong. so I need more and more visits to rooms full of experts. Actually I have been exercising my eyes using a black eye patch. My left eye was not so good at distance (across to room to watch the telly) so I put the patch on my right eye. This forced my brain to use my left eye for that distance. To begin with it took ages to focus but with effort and practise got faster and faster and now I only have to close my right eye for a few seconds for my left to come into focus and stay focused - the exercise did it good and uses glasses only made my eye weaker at focusing as my brain ignored the ever more blurred information. I will never get rid of the astigmatism but it's not getting worse (even one optician said "that strange, your eyes have improved").
I have now used the same technique for my right eye which has problems with book reading distance. But after about a year, I can now read without glasses at all.
So why go to the optician? Looking at the screen of my camera to check focus, I don't want to wait for my eyes to come into focus as they do take a few seconds. They can do it, but I need the information straight away and without any lag.