I have one of those gooseneck magnifiers, well I actually stole it from my wife, she used it for stitching. I don't like it. I have aging eyes, too, one of my biggest issues is I need bright light for everything, plus I wear glasses. The gooseneck is awkward and, while I use it, I usually revert to a handheld magnifying
glass I can more easily control. On mine, the lens is uneven, perhaps a better
quality device would
work better. I use the
lamp more for illumination.
That said, I think the answer for me would be a microscope with an option for 5X. Mine is 10X/20X and even at 10X, it magnifies too much for seeing the entire coin. It is wonderful for detailed
work, but I, like you, like seeing the entire coin filling the frame. When you wear glasses, a microscope is a pain at times.
I also got one of those magnifiers from Joe and I think the one I got was flawed. It was a cool little item. Hint, hint.
Virgil