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  1. Senior Member
    Student or Learner
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      • Native Language:
      • Arabic
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      • Malaysia
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      • Hong Kong

    • Join Date: Sep 2007
    • Posts: 823
    #1

    how can I answer?

    Hi there,
    My friend asked me the following questions. If I have -5 diopter, how can I answer?

    What's the power of your lens?

    Thanks
    pete


  2. Neillythere's Avatar
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      • Native Language:
      • British English
      • Home Country:
      • England
      • Current Location:
      • Thailand

    • Join Date: Mar 2008
    • Posts: 537
    #2

    Re: how can I answer?

    A diopter/dioptre is indeed the power of a lens:

    Dioptre - Wikipedia, the free encyclopedia

    A dioptre, or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres).


    • Join Date: Oct 2006
    • Posts: 19,434
    #3

    Re: how can I answer?

    Quote Originally Posted by peter123 View Post
    Hi there,
    My friend asked me the following questions. If I have -5 diopter, how can I answer?

    What's the power of your lens?

    Thanks
    pete
    It is not a question most people here expect to have to answer. They generally just know that their glasses are stronger than before. The specification is regarded as only important to the opticians.

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