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What do the numbers on my glasses mean?

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    Hi there! I've been wondering what these numbers mean on my prescription glasses - 50+(then a square symbol)18-135mm. Please explain! Thank you!
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    Do you know your prescription? Do you have an astigmatism?
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    mine say..

    50(square thingy) 15 - 132

    i reckon, its just measurements to do with the width of your glasses, etc
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    mine don't have anything but 135mm on them...don't think it means much!
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    49 (square thing) 19-140
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    The first number is the lens width, the second is the bridge width, and the last one is the length of the arms of your glasses.
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    Don't know, I don't have any numbers on them :p:

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