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    Refractive surgery screening devices valuable but not necessarily equal

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


    A consecutive series of 182 eyes of 91 patients who were possible surgical candidates underwent a refractive surgical evaluation using Scheimpflug camera and SD-OCT and were found to have suspicious screening parameters with an ectasia risk score of 3. The SD-OCT S-I and SN-IT values that were obtained were correlated individually with the ARTMax score and the SD-OCT values then were averaged and correlated with the ARTMax score using Pearson’s correlation coefficient (r).

    The Pearson’s correlation coefficients (r = –0.08 and r= –0.16, respectively) showed a poor correlation between ARTMax and SD-OCT S-I and SN-IT values when correlated individually, Dr. Weissman noted.

    The second analysis also showed a poor correlation (r = –0.12) between the technologies when the SD-OCT values were averaged together.

    The investigators concluded that the Pentacam HR ARTMax and SD-OCT indices were correlated poorly in patients with suspicious screening parameters. These two screening metrics are not analogous or interchangeable. The study was unable to determine the relative superiority of either device.

    Closing thoughts

    “More studies need to be carried out to prove the validity and agreement among refractive surgery screening modalities,” Dr. Weissman said. “Which machine gives us the most valuable information?”



    Heather Weissman, MD

    E: [email protected]

    Dr. Weissman and colleagues have no financial interest in the subject matter.


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