Rx blended monofocal

I am a candidate for cataract surgery, and after much research I plan to elect some form of blended monofocal rather than multifocal.
My question: since the focal power of the eye includes the cornea, how is it that Rx for monos (blended or not) can be arrived at in response to forum questions concerning particular individuals? I particularly have in mind suggestions that have been offered by Dr. J.C. Hagen III on this forum. His suggestions seem extremely practical and commonsensical and I like them; I'm just wondering how an Rx (even approx) can be arrived at without knowing the curvature of the cornea, much less other biometrics. I'm not trying to find fault, only trying to understand.
Thanks all for your support.

[Ray T Oyakawa, MD]

The formulas used to calculate the lens power takes the corneal power in consideration.  The main thing is to pick your target.   I don't do cataract monovision unless the patient was a successful monovision patient with contact lenses.

I like to do micromonosion with the Crystalens and target the nondominant eye to -.50 to -.50.

Dr. O.