Thanks for the suggestions so far, really appreciated.
I've tried head mounted magnifiers before, but find them rather clumsy and awkward to use. It probably doesn't help that the ones I've used have terrible stiff, plasticky head bands that are uncomfortable to wear and difficult to adjust correctly.
A hand held device won't work either; I need both hands free to solder. If I have a spare hand, I just use a cheap 7x loupe, which has served me well for many years.