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    Refractive surgery screening devices valuable but not necessarily equal

    Study evaluates correlation of Scheimpflug, ocular coherence tomography relational thickness metrics



    Refractive surgery screening devices do not provide results that are interchangeable.

    Dr. Weissman

    Atlanta—Many different technologies are commercially available for use by refractive surgeons to screen potential patients preoperatively.

    “Many of these machines provide similar information and assign values to patients who are at increased risk for developing ectasia after refractive surgery,” said Heather Weissman, MD, a resident at Emory Eye Center, Emory University, Atlanta. “There is overlap of some information between machines.”

    However, the question that currently remains unanswered is: Are these machines providing similar screening information?

    Retrospective study

    A comparison of Scheimpflug and spectral-domain optical coherence tomography (SD-OCT) values—superior-inferior (S-I) and superonasal-inferotemporal (SN-IT)—that were obtained from possible candidates for refractive surgery with suspect screening parameters showed that the values were poorly correlated and the two screening devices cannot be used interchangeably.

    Dr. Weissman and co-authors, Trey Nunnery, MD, and J. Bradley Randleman, MD, conducted a retrospective study to evaluate the correlation between the values obtained using Scheimpflug (Pentacam HR, Oculus Inc.) Ambrósio Relational Thickness (ARTMax) and SD-OCT (Optovue Inc.) when the S-I and SN-IT regions of the eye were measured.

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