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    Thanks

    Thanks again for your help.
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    Cross Curve Tool Formula?

    I know the thick lens formula and how to derive lap tool curves from this equation. What I need to know is how do you come up with the cross curves. It would appear that you just add the cylinder to...
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    Thank you for confirming. I was having a hard...

    Thank you for confirming. I was having a hard time figuring out why my calculations were always off.
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    Thank You

    I used the following formula to determine D1 used in your formula.

    Basecurve marked on box = 4.51 poly

    .586/.530 X 4.51 = 4.98(I then used this number for D1 stated in your forumula along...
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    Tool Curve Formula for thick lenses

    Hello, I am trying to find the formula to determine what tools to use for plus lens depending on the index of refraction. I know the thin lens formula but I do not know how to compensate for...
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