Comes to us all eventually - eyes OK but arms getting too short....... I used to be able to focus almost at the end of my nose then suddenly...wham - off they went.
I had trouble with my reading specs too. I found that the prescription ones put the instrument panel out of focus because it was slightly too far away to be classed as "reading". So I went to Boots and bought a weaker, frameless pair off the rack which I put on the end of my nose when flying. I look over them to see outside the aircraft. Perfect! I keep the prescription ones handy to read the very small print on Jepp plates etc. BTW, I think the CAA don't like pilots wearing bi-focal reading glasses, they have to use the half-frame type.