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  1. It's very complicated to calculate base curve...

    It's very complicated to calculate base curve when you know your prescription.
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    Thank you, I still try to calculate the cutted...

    Thank you, I still try to calculate the cutted lens edge thickness for plus and minus lens. It's hard to do it,thanks
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    If I use this formula to calculate centre...

    If I use this formula to calculate centre thickness of plus lens, how calculate the thickness of cutted edge ? any one could help me?
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    Sagitta = R - √(R^2 - (D / 2)^2) C.T. = S1 +...

    Sagitta = R - √(R^2 - (D / 2)^2)
    C.T. = S1 + E.T. - S2 (for plus lenses)
    E.T. = S2 + C.T. - S1 (for minus lenses)
    E.T. = edge thickness (in mm)
    C.T. = center thickness (in mm) ...
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    Great! thank you for your share:bounce:

    Great! thank you for your share:bounce:
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    Calculate the cutted lens Edge thickness

    I try to make one formula for Calculating the cutted lens Edge thickness. and Made one according to Spex and Darry forum. But I find that the formula are correct for negtive lens, but not for...
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    Hi Darry Do your formula for both Positive...

    Hi Darry

    Do your formula for both Positive and Negtive lens?
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