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    Centroid value, posterior cornea input adds game for toric calculators

    Advances reconsider surgically induced astigmatism: mean versus median versus centroid

     

    Centroid value

    Recently, surgeons have found that using a centroid value gives improved outcomes, Dr. Hill noted. A centroid value is the two-dimensional mean of SIA for a series of patients.

    Using data from a large physician database of more than 35,000 cases, Dr. Hill observed that for the typical temporal clear corneal incision, the calculated centroid value generally ranges from 0.08 D to 0.14 D.

    If a surgeon has not yet calculated a centroid value for a cataract surgery incision, he advised beginning with a centroid value of 0.12 D when using toric calculators. A centroid calculation can be carried out using a free tool (www.SIA-calculator.com).


    Dr. Hill also highlighted the currently available toric calculators in the United States, including the Bausch + Lomb Trulign, the Holladay IOL Consultant calculator, the Abbott Medical Optics calculator (Johnson & Johnson Vision Care), the updated Alcon calculator, and the Barrett toric calculator, available on the American Society of Cataract and Refractive Surgery website (www.ascrs.org/barrett-toric-calculator).

    “The Barrett toric calculator is currently the most advanced one we have,” Dr. Hill said. “[Dr.] Koch gave us the gift of the posterior cornea and [Dr.] Barrett made it practical for all of us.”

     

    Warren E. Hill, MD

    E: [email protected]

    This article was adapted from Dr. Hill’s presentation during Refractive Subspecialty Day at the 2016 meeting of the American Academy of Ophthalmology. Dr. Hill is a consultant for Alcon Laboratories.

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