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Thread: aspheric lenses

  1. #1
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    aspheric lenses

    what are the consequences, if any of using an aspheric lens with a spherical lens?

  2. #2
    One eye sees, the other feels. OptiBoard Gold Supporter
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    Quote Originally Posted by Kevin Howtopat View Post
    what are the consequences, if any of using an aspheric lens with a spherical lens?
    Hi Kevin. Depending on the P value of the aspheric design and the Rx, we'll usually see two different base curves, up to about 2 D, resulting in image size disparity. One could use a flatter than best form base curve on the spherical lens to compensate, but that lens will have more marginal astigmatism. I'd need to have a good reason to proceed this way, possibly due to existing anisometropia, aniseikonia, low vision, safety, etc.

    Hope this helps,

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

  3. #3
    OptiBoard Apprentice
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    hello. i want to know if aspheric lens (hoya nulux eynoa 1.67) whether focal point changes can be made in RX? (for diameter purposes)
    thank you

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