Posterior keratometry values repeatable with SS-OCT
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Posterior keratometry measurements are “highly” repeatable using the IOLMaster 700’s swept-source OCT capability, Seth Pantanelli, MD, told Healio/OSN.
In a poster presented at the European Society of Cataract and Refractive Surgeons meeting, Pantanelli and co-authors compared the repeatability of keratometry values using the SS-OCT (Carl Zeiss Meditec) with values obtained with dual-Scheimpflug Placido-based tomography/topography (Galilei G4, Ziemer).
In the prospective study of 82 eyes of 48 patients conducted at Penn State College of Medicine, Pennsylvania, posterior corneal curvature (PK) values obtained with SS-OCT were more repeatable, with a mean within-subject standard deviation of 0.03 D, than were anterior corneal surface measurements, with a mean within-subject standard deviation of 0.12 D.
Between devices, analysis showed a high level of agreement and probable interchangeability for anterior corneal surface measurements, but only moderate agreement and a lack of interchangeability for posterior corneal curvature measurements.
Consistently flatter posterior corneal curvatures were reported with the IOLMaster 700 than the Galilei G4 (P = .0001).
“Posterior keratometry measurements taken with the SS-OCT device are highly repeatable; however, they are not interchangeable with those obtained using the comparator device in the study, Pantanelli said. “This is particularly important when using measured posterior corneal curvature measurements with the Barrett True K formula in post-LASIK eyes. The device from which the measurements were derived must be identied correctly, or one may expect erroneous predictions on the part of the calculator.”
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Cui D, et al. Repeatability of posterior keratometry measurements obtained with swept-source optical coherence tomography and comparability to measurements using Scheimpflug-based tomography. Presented at: European Society of Cataract and Refractive Surgeons meeting; Oct. 2-4, 2020 (virtual meeting).
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