My dentist has tried several magnifiers. The frames varied but most
had the same basic design: A headstrap and two magnifying lenses.
The magnifier he likes best looks like a pair of mini-binoculars
strapped to his head! The short depth of field that you get from
zoom lenses is usually considered a drawback, but he said it’s a
plus. “The best thing about these is that my back doesn’t hurt
anymore. Whatever I’m looking at has to be a fixed distance away for
me to see it clearly. These are adjusted so I can’t hunch over while
examining teeth, forcing me to use good posture.”
I, too, tend to hunch over my work, which makes my back hurt and
nose sting (from the occasional whiff of melting flux). Using
binocular-type magnifiers could help, but I’m wondering if the short
depth of field would be annoying. Have you tried these?