Gotcha. Next thing I would recommend (also mentioned above) is a desk-mount magnifier. Most of them suck (I hunted for a good magnifier for years and every one I found was junk), but I've found these to be absolutely top notch. I have an older fluorescent one on my main desk and a newer LED one on my workbench. The one I have is pretty expensive but I easily use it anywhere from 10-100 times a day:
Magnifying lighting solution designed to enhance your detailed tasks with exceptional clarity, contrast, and color matching.
daylightcompany.com
When I'm building something like a tube amp I use it for just about the entire process. I use it for soldering, closeup guitar inspection, troubleshooting damn-near anything - you name it. They make smaller ones and less expensive desktop models, too.
The first one I got as a gift from my wife probably 15 years ago, and while it's showing its age it still gets daily use and I've never had to replace the tube. The new LED models are more robust because LEDs essentially last forever so they can glue it all shut since there's no need to get into it to replace tubes. You can see it in some of my wokbench pics like this one that I posted in the Nixie thread:
The new one has four levels of brightness on the ring of LEDs that surround the lens. The old one is just on/off because it's fluorescent.
A pretty expensive solution just for string changes but if you find yourself needing more magnification I can't recommend these enough.
I've also got a set of OptiVisors that I use when I need more magnification. I altered these to have LEDs around the lenses:
Those you can even get at Stewmac. They are the best of the visor type solutions I've found because they flip up easily and they work while you're wearing glasses.