Good thread...
I was told back when I had excellent eyesight to expect a need for glasses around 45. Well at 46, I needed reading glasses and like others above got the half moon style that sat on the end of the nose or on a string around the neck when not required. Not long later further enhancements were required. Multifocals were not good in the cockpit for me. I tried Tri vocals for a while to read the panel above, but found it easier with the bi-foals and tilting the head back as mentioned above. I found it does not get any better as the years roll on, but that's the way it is!
My second pair has always been my "anti-glare" glasses. Used to be ok, but who knows now??
The danger now is screwing your old eyes trying to read your iPad or phone!!
