I recently got a new pair of glasses (progressive bifocals, so yes I’m over 40), and I was closely examining the lenses while wearing a different pair of magnifying glasses. The new glasses weren’t working so well, so I thought I’d look for flaws in the lenses.
What I found instead were some letters and numbers imprinted on the lenses. On each lens I can clearly read the letters “CDX” underneath a circle and the numbers “200” also underneath a circle. The light has to hit the lens in just the right way to see the imprinting, but it’s definitely there. Usually I would not be able to see something so small up close (being farsighted), but I was wearing a different pair of magnifying type glasses at the time.
Is the imprinting supposed to be there? What does it mean? Could it be affecting my vision?
Thanks in advance.