Bizarrely enough, I worked in an engineering office that happened to be located in an airport control tower. With me working on a computer most of the time and looking out of the window at every aircraft that made an approach improved my eyesight to where at my class one renewel I was told if the improvement carries on as it is I'll have no need of glasses within the year. Unfortunately I changed job and I think my vision is backsliding. So I think there is a lot involved in exercising the eyes especially for me.
I'm very interested in what LGB has to say about the reading glasses but forgive my ignorance, what are the +1, +2 etc. references about? Are we talking Dioptas? I can't remember my prescription but can find it as required. But are you saying that all I need to do is wear a pair of reading glasses when working at my computer or reading a book? I assume for mid range i.e. tv just keep the glasses off? At the moment all I wear my glasses for is driving and flying.