Question: We have your software and use it as our primary calculator for iol power calculations. I need to perform a lens exchange for an unexpected outcome. I am unclear how to use your Holladay R calculator. Do you have any instructions for how to calculate the replacement lens for an IOL exchange?
- All you need to do is change the REFRACTION on the PREOP SCREEN to the CURRENT REFRACTIVE SURPRISE.
- Then CLICK IOL CALC and change the FORMULA to Holladay R (REFRACTIVE).
- The displayed powers are what must be added (or subtracted) from the CURRENT IOL to achieve the DESIRED REFRACTION. Example: If current IOL is 20.0 D and the Holladay R shows -3.5 D for the Desired Refraction, then 20.0 – 3.5 = 16.5 D IOL for the exchange. The -3.5 D is also the power of the Secondary Piggy Back for reference.