Hello James, I have the binocular type scopes mounted on an eyeglass
frame like you found. I got them from my optomitrist several years
ago and paid about twice what Rio's charging, I might add! The
brand is different though. Mine are metal housed.
Here is what I have found. These guys are heavy! There is a strap
on mine connecting the earpieces - sort of like athletes use to
secure their glasses. I'm afraid they'd fall off otherwise. Their
weight makes them uncomfortable to wear for extended times - talk
about mashing the bridge of your nose! Pupillary adjustment is a
little tricky. Once you get them adjusted to your eye spacing, then
you will see one field, and have good binocular vision with 3-D
There are times when I have used these, but I much prefer using my
desk scope. Maybe these are plastic housing and lighter weight.
Perhaps Rio will have some of these at the Tucson tool show. That
would allow you to try them out and know more about how they feel to
Judy in Kansas