Hey guys,
I wanted to put this to you guys. I have done a little bit of research, but I wanted to know what you thought. There is a discrepancy between the effective power formula in a few books:
In "System for Ophthalmic Dispensing" the formula reads:
In "Clinical Optics", the formula reads:
However, in "Optical Formulas Tutorial", it reads:
note: I've changed all of the variables to the same symbols to avoid confusion
Now, I know that the Clinical Optics version is the same as System (just a simplified version). But Something is very obviously wrong because even after every derivation I can think of applying to the top two equations, you cannot get the formula from Optical Formulas Tutorial. I sure it's a typo or just an error in simplification. It's interesting considering this is a text that is so highly recommended. Just goes to show you that you can't take everything you read as accurate.
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