Gentlemen,
I am looking for a formula to find center & edge thicknesses so I can do comparisons. The only varibles I know are index of refraction, lens Rx, effective diameter of frame, thinnest edge/center, & front base curve. The end result I would like to find is what would be the center thickness of a plus lens or the thickest edge thickness of a minus lens with different indexes of refraction.
Several formulas or programs that I have found that will do calculations like this require unknown information. For example: One program prompts you to input front & back surface curves. If you only have the Rx & front base curve, the back surface curve will be different on each index of refraction. But if a formula knows the index of refraction, front base curve, & Rx, it should be able to calculate the back surface needed, & therefore calculate the edge or center thicknesses on either plus or minus power lenses.
I hope I have been clear enough so that everyone can understand what it is I am looking for. If not PLEASE, post what it is I have missed so that I can finally get what I am looking for.
Thanks in advance!!
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