Results 1 to 17 of 17

Thread: Lens Thickness Calculator

  1. #1
    OptiBoard Apprentice kwon0504's Avatar
    Join Date
    Jan 2007
    Location
    Edmonton
    Occupation
    Dispensing Optician
    Posts
    20

    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

  2. #2
    OptiBoard Apprentice
    Join Date
    Dec 2005
    Location
    Braga
    Occupation
    Optometrist
    Posts
    22
    Gotta be kinding me! :-O Undoubtely one of the best I ever seen. Congratulations. I are worth of it.

  3. #3
    ATO Member HarryChiling's Avatar
    Join Date
    Apr 2005
    Location
    Nowhereville
    Occupation
    Other Eyecare-Related Field
    Posts
    7,769
    Very Nice, thanks.
    1st* HTML5 Tracer Software
    1st Mac Compatible Tracer Software
    1st Linux Compatible Tracer Software

    *Dave at OptiVision has a web based tracer integration package that's awesome.

  4. #4
    OptiBoard Professional
    Join Date
    Aug 2005
    Location
    Braunschweig Germany
    Occupation
    Lens Manufacturer
    Posts
    115
    Looks very good. Thank You very much.

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

    Rafael

  5. #5
    Seeker of perpetual knowledge specs4you's Avatar
    Join Date
    Apr 2007
    Location
    lala land
    Occupation
    Dispensing Optician
    Posts
    229
    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.

  6. #6
    ATO Member HarryChiling's Avatar
    Join Date
    Apr 2005
    Location
    Nowhereville
    Occupation
    Other Eyecare-Related Field
    Posts
    7,769
    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
    1st Mac Compatible Tracer Software
    1st Linux Compatible Tracer Software

    *Dave at OptiVision has a web based tracer integration package that's awesome.

  7. #7
    Seeker of perpetual knowledge specs4you's Avatar
    Join Date
    Apr 2007
    Location
    lala land
    Occupation
    Dispensing Optician
    Posts
    229

    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
    OptiBoard Apprentice kwon0504's Avatar
    Join Date
    Jan 2007
    Location
    Edmonton
    Occupation
    Dispensing Optician
    Posts
    20

    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

  9. #9
    OptiBoard Professional
    Join Date
    Aug 2005
    Location
    Braunschweig Germany
    Occupation
    Lens Manufacturer
    Posts
    115
    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
    OptiBoard Apprentice kwon0504's Avatar
    Join Date
    Jan 2007
    Location
    Edmonton
    Occupation
    Dispensing Optician
    Posts
    20
    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

  11. #11
    Bad address email on file
    Join Date
    Apr 2007
    Location
    India
    Occupation
    Other Optical Manufacturer or Vendor
    Posts
    4

    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
    OptiBoard Apprentice kwon0504's Avatar
    Join Date
    Jan 2007
    Location
    Edmonton
    Occupation
    Dispensing Optician
    Posts
    20
    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

  13. #13
    Master OptiBoarder OptiBoard Silver Supporter
    Join Date
    Jan 2005
    Location
    Back in NYC.....Shenzhen, China and Hong Kong
    Occupation
    Other Optical Manufacturer or Vendor
    Posts
    1,146
    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
    Join Date
    Sep 2010
    Location
    Shanghai China
    Occupation
    Lens Manufacturer
    Posts
    24
    thanks very much!
    this tool is excellent. I will introduce to my LAB manager.
    Hello, this is Kevin Wan! :cheers:

  15. #15
    Bad address email on file
    Join Date
    Dec 2011
    Location
    Brevard County, FL
    Occupation
    Ophthalmic Technician
    Posts
    1

    Awesome tool!

    This is going to be extremely helpful! Thanks!

  16. #16
    OptiBoard Professional
    Join Date
    Oct 2009
    Location
    World
    Occupation
    Optical Laboratory Technician
    Posts
    128
    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
    Join Date
    Mar 2009
    Location
    Romania
    Occupation
    Optometrist
    Posts
    35
    With Plus lenses it should require to manualy insert the diameter of the lens.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Replies: 7
    Last Post: 11-30-2006, 07:55 AM
  2. Blank Thickness Calculator
    By Darryl Meister in forum Ophthalmic Optics
    Replies: 0
    Last Post: 06-11-2005, 03:07 PM
  3. lens thickness calculator
    By vseyewear in forum General Optics and Eyecare Discussion Forum
    Replies: 2
    Last Post: 04-16-2005, 08:32 PM
  4. Replies: 0
    Last Post: 02-05-2004, 12:45 AM
  5. Lens Center & Edge Thickness Calculator
    By Spex in forum Ophthalmic Optics
    Replies: 8
    Last Post: 02-27-2002, 05:17 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OptiBoard is proudly sponsored by:
Younger Optics, Carl Zeiss Vision Inc., Vision Systems, Inc., Optitech USA and The Optical Group