I think it’s the Zeiss medical binocular glasses you’re talking
about, designed for micro-surgery. There are three or more focal
ranges - 30cm, 40cm and 45cm, so it is important to be able to test
drive. The first pair I tried had a focal length of 45cm, and I
couldn’t work with them at all -
felt as though I was trying to work with my arms outstretched. The
30cm on the other hand - ah, bless Zeiss. They are worth every penny
to my aging eyes.
I found mine through the Zeiss medical division who have a
representative here in Perth, West Australia - probably not much
different elsewhere in the world.
Hans, if it is you that is looking for them - yes, I know they are
expensive. But they are wonderful - they are light, have a good wide
focal area, good depth of field, you can look around the side of
them if you need a tool that’s not within the focal range, my eyes
don’t tire as much. I have my own prescription lenses in the
spectacles to which the binoculars are fixed, so when I don’t need
the binoculars for a while, I just angle them up out of the way.