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PCRusty:

The trick with the Opti-Visors is to decide on a "working distance" before you choose a magnification level.

I sat at my tying bench and measured the distance from my face to the vise...

PCRusty:

If you don't mind looking like Atom Ant the on the head type of magnifiers like Opti-Visor are the ticket.

They never get in the way while tying; (I used to constantly bump my bench...