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Comment & Response
July 2016

Origin of Multiple Formula Use to Calculate Intraocular Lens Power—Reply

Author Affiliations
  • 1Wilmer Eye Institute, Baltimore, Maryland
  • 2Jules Stein Eye Institute, University of California, Los Angeles
JAMA Ophthalmol. 2016;134(7):848-849. doi:10.1001/jamaophthalmol.2016.1049

In Reply We appreciate Dr Hoffer’s interest in our article and respect his contributions to the field as well as the contributions of others mentioned in his letter. He mentions the “concept” of multiple formulas and how it evolved because no one formula gives acceptable results in every situation. We think everyone can agree that access to multiple formulas was needed, but perhaps the change of the SRK I formula to the SRK II formula (and the subsequent adjustment to the A-constant based on axial length) was the first solution to this dilemma prior to our article.1 Indeed, as Hee stated, we “formalized” the approach to the use of many formulas.2 We chose our formula based on peer-reviewed literature. We could have included more formulas if we had wanted, but we decided to choose formulas already validated in the literature.

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