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Medical Forum / General / Vision / March 2007What is this "O 22" on my glasses?
I was cleaning a pair of polycarbonate glasses today and I noticed both lenses says "O 22" near the center. It seemed to be pressing into the plastic rather than printed. I hadn't cleaned them before with glasses on, and with them I can't see the markings. What the heck is it, and does it matter? > I was cleaning a pair of polycarbonate glasses today and I noticed both > lenses says "O 22" near the center. It seemed to be pressing into the > plastic rather than printed. I hadn't cleaned them before with glasses on, > and with them I can't see the markings. > > What the heck is it, and does it matter? its a marking that goes on progressive lenses that serve as reference points. it does not matter. > I was cleaning a pair of polycarbonate glasses today and I noticed both > lenses says "O 22" near the center. It seemed to be pressing into the > plastic rather than printed. I hadn't cleaned them before with glasses on, > and with them I can't see the markings. > > What the heck is it, and does it matter? the 22 means that the bifocal add is +2.25 diopters in strength. the O is simply a position marker that allows opticians to line up and correctly orient the lenses in the frame. |
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