What is this "O 22" on my glasses?

Discussion in 'Glasses' started by Toller, Mar 13, 2007.

  1. Toller

    Toller Guest

    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?
     
    Toller, Mar 13, 2007
    #1
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  2. its a marking that goes on progressive lenses that serve as reference
    points.
    it does not matter.
     
    michael toulch, Mar 13, 2007
    #2
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  3. Toller

    p.clarkii Guest

    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.
     
    p.clarkii, Mar 14, 2007
    #3
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