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    ‘Super formula’ maximizes accuracy for IOL powers

    Method broadens understanding of calculations, improves outcomes, stimulates research

    Take-home message: An IOL “super formula” may broaden the conceptual understanding of IOL calculations, improve clinical outcomes for patients, and stimulate further progress in IOL formula research.

    Baltimorenovel method has been developed that visualizes three-dimensional IOL formulas.

    Referred to as the “super formula,” the Ladas Super Formula is comprised of the ideal segments taken from five of the existing IOL formulas currently used and uses the ideal IOL formula for individual eyes, said John G. Ladas, MD, PhD.

    The investigators who developed this method hope that it will fulfill three goals: “broaden the conceptual understanding of IOL calculations, improve clinical outcomes for patients, and stimulate further progress in IOL formula research.”

    Related: Novel trifocal IOL extends range of vision

    Surgeons can attest to the fact that calculating the appropriate IOL power for individual patients can be difficult.

    However, undertaking the task is important to obtain the best vision possible postoperatively, said Dr. Ladas, assistant professor of ophthalmology, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore.

    As Dr. Ladas and colleagues pointed out, in general, all of the existing IOL formulas are highly accurate in predicting which IOL should be used for certain refractions.

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    “However,” they noted, “certain formulas have been found to be more accurate under specific conditions related to the input variables that are used, such as axial length and corneal power, which is likely related to the different ways the formulas use these data to determine the theoretical effective lens position based on the input data.”

    However, the rub is that no one formula performs perfectly in all situations, surgeons must then make an educated guess about which formula to use.

    Working with Albert Jun, MD, PhD, Aazim Siddiqui, MD, and Uday Devgan, MD, they developed a method to represent IOL calculations in three dimensions. This methodology uses the most accurate and current information on IOL formulas, adjustments, and lens design to create one “super surface” leading to the development of an IOL super formula.

    Existing formulas

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