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  1. Replies
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    5,650

    ya thanks, that was helpful.

    ya thanks, that was helpful.
  2. Replies
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    5,650

    hyperocular lens

    can anyone please explain to me what a hyperocular lens is please..:hammer:
  3. Thread: changeover

    by benice
    Replies
    4
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    3,967

    changeover

    can someone help me with the following please:

    would this changeover be acceptable:
    R: -4.00/-1.00x90
    L: -4.00/-1.00x90

    change over to replace a clients broken frame is 56-14
    new frame is...
  4. Replies
    2
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    16,312

    thank u so very much.

    thank u so very much.
  5. Replies
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    16,312

    Image jump-please help

    hi can anyone help me with this question please?

    calculate image jump for:
    CR-39 flat top (distance from segment OC to segment top= 4mm) add +1.75D.

    thanks.;)
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