Comparison of Artemis 2 Ultrasound and Visante Optical Coherence Tomography Corneal Thickness Profiles

Ursea, Roxana; Feng, Matthew; Urs, Raksha; RoyChoudhury, Arindam; Silverman, Ronald H.

Purpose: To compare corneal thickness profiles of cross-sections of cornea determined by arc-scanned immersion ultrasound and optical coherence tomography (OCT).
Methods: Corneas of 28 eyes from 14 participants were scanned in triplicate using the Artemis 2 high frequency arc-scanned ultrasound system (ArcScan Inc) and the Visante OCT system (Carl Zeiss Meditec). Corneal thickness and reproducibility were compared within 3.5 mm of central cornea in the horizontal plane.
Results: Although highly correlated, Visante central and peripheral corneal thickness values were systematically thinner than Artemis 2 values. Within the central 0.5 mm, the difference was approximately 8 μm, but the difference increased with distance from the center. Reproducibility for each instrument was comparable, measuring 4 μm centrally and increasing peripherally.
Conclusions: Visante OCT measurements of corneal thickness are thinner than Artemis 2 ultrasound values centrally with an increasing difference with peripheral position. Measurement reproducibility was comparable for the two techniques.



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Journal of Refractive Surgery

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November 21, 2013