For doing fine PCB work I picked up a Vision Optics Mantis. (3D microscope). It is a really nifty device with a single large ‘viewport’ instead of eyepieces. It gives you a very stereoscopic view that you can pan and tilt around.

Optically it appears like large objects at a reasonable distance, so I can wear my regular long range vision glasses and things are in perfect focus. Neat technology. (I don’t know Paul Yaw, you might just have to get one).