Was going to a music performance; elderly woman behind me
had on glasses of a type I'd never seen before.
It was if she had two pair of glasses, one about one inch
out in front of the other pair.
I got a close look at them, and it wasn't some glued-up
hack job -- they were clearly manufactured from scratch
to be like that.
A: What is the generic name for that type of glasses?
B: What is it, acting as a telescope? (But as far
as I could tell it didn't invert the image.)
C: how long have these thing been around?
D: No -- stupidly, I didn't study the individual
near and far lens, to see if they were both
convex or concave or one of each.
Thanks!
David
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