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Thread: Iseikonic Lens Calculator

  1. #1
    OptiBoard Novice
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    Confused Iseikonic Lens Calculator

    Hi...student here! On the magnification calculator available here on OptiBoard, I am not sure how to read the magnification percent, as there are two numbers given...any help out there?
    OD +1.00 -0.25 180 BC 7.00D Cthickness 3.3mm VD 14mm

    OS +3.50 -0.25 175 BC 9.00D Cthickness 4.3mm VD 14mm

    The answer is supposed to be 3.4% magnification difference, but when I put the numbers into the calculator, I get...
    OD Spectacle Magnification:
    3.0% / 2.6% × 180

    OD Spectacle Magnification:
    7.9% / 7.5% × 175

    I do not know how to come up with 3.4% regardless of number combinations!
    Following this step I need to change some parameters, but if I can't read the answer correctly I can't even get to the next step!
    *Just coming off of COVID and pneumonia, so I haven't been to class in a month..trying to catch up on discussion board posts from my professor!

  2. #2
    One eye sees, the other feels. OptiBoard Gold Supporter
    Join Date
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    Location
    Wauwatosa Wi
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    Dispensing Optician
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    Welcome to OB.

    I hope you have a short and full recovery.

    The calculators on OB were written by Darryl Meister.

    https://www.2020mag.com/article/reme...darryl-meister

    He used more complex and accurate equations, for example, probably using Remole's equations instead of Prentice.

    https://pubmed.ncbi.nlm.nih.gov/11100894/

    Best regards,

    Robert Martellaro
    Roberts Optical Ltd.
    Wauwatosa Wi.
    www.roberts-optical.com
    ~~~~~~~~~~~~~~~~~~
    Science is a way of trying not to fool yourself. - Richard P. Feynman

    Experience is the hardest teacher. She gives the test before the lesson.



  3. #3
    OptiBoard Novice
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    Thank you!

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