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    Why recalibration for EKR devices may be crucial

    Further calibrations for the equivalent keratometry readings (EKR) obtained by the Pentacam High Resolution (HR) (Oculus, Germany) should be conducted before they are used for total corneal power assessment in post-LASIK eyes, researchers said.

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    “Compared to the total corneal power obtained by the clinical history method, the equivalent keratometry values generally overestimated the total corneal power in post-LASIK eyes,” wrote Yanjun Hua from Shanghai Jiao Tong University and colleagues.

    The researchers published their findings in PLOS One.

    In order to predict IOL power after corneal refractive surgery, clinicians must accurately assess total corneal power.

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    The clinical history method and the double-K methods both require preoperative data. The Maloney method, the Shammas formula, and the BESSt formula do not require preoperative data. The Holladay’s equivalent keratometry readings obtained by the Pentacam HR also doesn’t require preoperative data, but it’s precision for assessing total corneal power after corneal refractive surgery is not well established.

    The researchers wanted to assess the repeatability of the equivalent kearatometry readings in all central corneal zones.

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    They enrolled 100 untreated eyes (from 47 men and 53 women) with a mean manifest spherical equivalent refraction of -3.23 D. They also enrolled 71 post-LASIK eyes (from 24 men and 19 women) with a mean manifest spherical equivalent refraction of -5.01 before the surgery and 0.03 after the surgery. The mean amount of refraction change in dioptres before and after the surgery was 5.05.

    In both the untreated group and the post-LASIK group, all the Sw values were less than 0.22 D, the 2.77Sw values were less than 0.62 D and the CVw values were less than 1%. All the intraclass correlation coefficients were higher than 0.978.

    Significant differences

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