My eye guy told me that as we age our eyes become less elastic and able to adapt to changing conditions (ie: near and far)
I am mildly nearsighted. I need glasses to see far away when I drive, to read signs. The trees in the distance are a blur, but I can see the individual trees that are closer, even when they are grouped together. When I put on the glasses, I can see all of the trees as individual trees.
I only use my glasses when I drive although I did need them to see the blackboard when I was in school due to my desire to stay off the radar and sit in the back of the room (and I blocked others' view of the board!)
It's only been in the past few months that I have found myself resorting to reading glasses, even though I have had a scrip for bifocals since 2001. Denial worked for me, but it doesn't anymore...so I use them when I need them. When I found myself moving the books closer and further away in order to focus, I knew it was time!