So not being the trusting sort and experiencing a lot of job coming up off power, I've decided to find a way to double check the curves that our computer system is coming up with. I'm using the formula:
F2=-(n*F1-t*Fv*F1+n*Fv)/(n-t*F1)
F2=back curve
n=index of refraction
F1=front curve
t=thickness
Fv=the back vertex power
which I figured out using a formula that Daryll gave in another discussion and rearranged it to fit the information that I had available. It seems to work quite well (Thank you Daryll!) The only exception is when I use this on any of our aspheric lenses it comes up way off from what my computer is telling me!
Now my question is: Is there something with aspheric lenses that I am not taking into account, or is my computer system just really that far off?
Or is this formula off to begin with?
I am willing to believe any of these things, but I'm just not sure which one to believe.
Can anyone help me out?
Thanks in advance!
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