Oldjarhead ~
Two possibilities, a cheap one and a not-so-cheap one.
The not-so-cheap one is just to get shooting glasses made for yourself. I know several shooters who have done this. You can go in and tell the optometrist you need a clear focal point at (measurement in inches) from your eye, and they can build you glasses to fit that point. Or you can tell them you need upside-down bifocals, with the close lens at the top and the distant lens at the bottom. It doesn't cost any more than regular bifocals, but you'll have to get the eye exam and then buy glasses.
The cheap method? Just get yourself a magnifying sticker ("stick on bifocals" like
these) to put in the right place on your regular glasses. They really work.
pax