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Thread: Lens Thickness Calculator

  1. #1
    Bad address email on file kwon0504's Avatar
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    Lens Thickness Calculator

    Thought some of you might be interested in this calculator I developed to determine lens thickness.

    Sung S. Kwon
    Attached Files Attached Files

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    Gotta be kinding me! :-O Undoubtely one of the best I ever seen. Congratulations. I are worth of it.

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    ATO Member HarryChiling's Avatar
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    Very Nice, thanks.
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    Looks very good. Thank You very much.

    But I need you help, why i get results only for minus lenses and plano?

    Rafael

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    Seeker of perpetual knowledge specs4you's Avatar
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    Would love to see your calculations, apparently it only is able to open with Excel format, which unfortunately I don't have. Any other way to send it?
    Can you open it and and send as an attachment to me in e mail, would that work. Any ideas Opti friends?

    Thirsty for knowledge.

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    ATO Member HarryChiling's Avatar
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    specs4you,

    you can download and install openoffice which is a free version of the office programs. www.openoffice.org they have a spreadsheet program that will open excel files.
    1st* HTML5 Tracer Software
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    Seeker of perpetual knowledge specs4you's Avatar
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    Thumbs up Harry, you're the best, trying now....thx

    thanks a heap.......have a great day all......
    Quote Originally Posted by HarryChiling View Post
    specs4you,

    you can download and install openoffice which is a free version of the office programs. www.openoffice.org they have a spreadsheet program that will open excel files.

  8. #8
    Bad address email on file kwon0504's Avatar
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    Lens Thickness Calculator ver.4.3

    Quote Originally Posted by Rafael View Post
    Looks very good. Thank You very much.

    But I need you help, why i get results only for minus lenses and plano?

    Rafael
    I revised the calculator in response to Rafael's comment. Good point, thanks.
    Attached Files Attached Files

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    Thank you again,

    if you have time do fix the follow points, it would be great:

    a) for minus lenses if i set the ct it calculates acurate,
    but if i put the et for plus lenses i get wrong results.
    The set edge thickness = the centerthickness.
    Would be fine if the programm can calculate the Ct, or even better
    the thickess on radius and axis, we can choose.

    b) Please check the input for the cylinder, on minus lenses the calculations works only if the cylinder is put in (-) Value.

    On plus lenses the calculation with cylinder doesent work, for (+) and for (-) value.

    Would be fine if both combinations are possible for the data entry.


    Rafael
    Last edited by Rafael; 04-05-2007 at 05:16 AM.

  10. #10
    Bad address email on file kwon0504's Avatar
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    Quote Originally Posted by Rafael View Post
    Thank you again,

    if you have time do fix the follow points, it would be great:

    a) for minus lenses if i set the ct it calculates acurate,
    but if i put the et for plus lenses i get wrong results.

    Rafael
    The formulas calculate the center thickness of the lens for plus lenses.
    Therefore, the Lens Thickness Graph will show you the center thickness
    no matter what axis it is.
    If you have (+) Sph with (+)Cyl, the program will calculate the
    strongest power after transposing. For example, if you selected the Rx =
    +3.00 +1.00 x 180, it will calculate the thickness with the power of
    +4.00 D and the longest distance from OC.

    Hopefully, that helps. Thanks.
    Sung

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    for high index

    Hi ,

    I appreiciate your work. But this index thickness is only pertaining to a 1.5 index right what if the patient wants to know at the higher index's that is 1.67/1.7/1.8 and 1.9 then how can we calculate the thickness value using your calculator.

    PSI

  12. #12
    Bad address email on file kwon0504's Avatar
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    Quote Originally Posted by PSI View Post
    Hi ,

    I appreiciate your work. But this index thickness is only pertaining to a 1.5 index right what if the patient wants to know at the higher index's that is 1.67/1.7/1.8 and 1.9 then how can we calculate the thickness value using your calculator.

    PSI
    Click on the "Lens Material" dropdown box to select the lens material you want to use or check. For high index, I added 1.60, 1.67, 1.70, 1.74, 1.80, and 1.90. It also includes CR39, Crown Glass, Trivex(1.532), Spectralite, Alphalite, 1.56 Mid-Index, and Ploycarbonate lenses.

    Sung

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    I was occassionally using this excel for quick calculations and today I tried to run it on a high plus power lens but it would not work. Can someone try this excel on their computer and tell me if they are having the same problem or is it just me?

    Thanks in advance,
    Doc

  14. #14
    OptiBoard Apprentice conantoptics's Avatar
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    thanks very much!
    this tool is excellent. I will introduce to my LAB manager.
    Hello, this is Kevin Wan! :cheers:

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    Awesome tool!

    This is going to be extremely helpful! Thanks!

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    Quote Originally Posted by kwon0504 View Post
    The formulas calculate the center thickness of the lens for plus lenses.
    Therefore, the Lens Thickness Graph will show you the center thickness
    no matter what axis it is.
    If you have (+) Sph with (+)Cyl, the program will calculate the
    strongest power after transposing. For example, if you selected the Rx =
    +3.00 +1.00 x 180, it will calculate the thickness with the power of
    +4.00 D and the longest distance from OC.

    Hopefully, that helps. Thanks.
    Sung
    The program doesn't calculate:

    in case of plus prescription (the sphere only)
    in case of plus cylinder

  17. #17
    OptiBoard Apprentice wilddevil's Avatar
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    With Plus lenses it should require to manualy insert the diameter of the lens.

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    Nice

  19. #19
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    Nice

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