As a crafter, and someone who just doesn't get on with varifocals, I found myself forever taking my glasses on and off, then searching for them whenever I needed to see up-close! I was at a local craft fair when I saw and bought a simple glasses chain. At the time I thought I'd probably not wear it as it seemed a bit 'headmistressy', but I have to say, I've found it to be a Godsend.
Now, when I'm in my workshop, I wear it to keep my glasses at hand and I've even discovered it makes a nice alternative to a necklace to dress up any outfit when I'm going out and know I'll need my specs e.g. to read a menu.
I've even started a trend in my home town, with the owner of a local boutique wearing them and recommending them to her customers!