There were a few questions from some of us in the over 40 crowd
about magnifiers other than the Opti-Visor.
I’ve been using one that clips on your glasses with a spring
above & below the lenses, the magnifier is mounted on a beam
that positions it about 2. 5" in front of the lenses.The beam
pivots at the glassses & the magnifier pivots at the end of the
beam. I haven’t found a situation it wouldn’t wo rk in & I wear
tri-focals.Rio has it on p88, item ‘E’ in their 97 tool catalog,
K.H. Lee, 800-435-4966, has a magnifier that clips over glasses
ala clip on sun glasses. He has them in 3 different
magnifications for about $10.00. I’ve got the 3x about 6 months
ago & it works fine.