While IOL power calculation formula selection is a critical component of the pre-surgical planning process, it should always be used in conjunction with an optimization of the optic media including adequate surface lubrication, validation of diagnostic testing for quality, lens constant optimization, meticulous intraoperative technique, tailoring of the IOL model to the patient's needs and desires, and careful post-operative manifest refractions to evaluate for unexpected outcomes. Herein, we seek to compile a list of formulas for use in surgery naïve eyes (Table1), those with clinically significant astigmatism in which a toric IOL is anticipated (Table 2), and those with a history of corneal refractive surgery (Table 3). Substantial progress has been made since Fyodorov introduced the classical vergence formula and a myriad of methods have since been developed to handle unique populations of patients. Achieving this requires that the surgeon choose an appropriate IOL power calculation formula, which is not a trivial task. 1.3 Table 3: Post-Corneal Refractive Surgery IOL Power Calculation FormulasĪn increasingly important objective of cataract surgery is the minimization of refractive error.1.1 Table 1: Spherical IOL Power Formulas.
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January 2023
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