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COMPARATIVE STUDY
JOURNAL ARTICLE
OBSERVATIONAL STUDY
Comparison of central corneal thickness measured with anterior segment optical coherence tomography versus ultrasonic pachymetry.
Archivos de la Sociedad Española de Oftalmología 2013 Februrary
PURPOSE: To compare central corneal thickness measured with anterior segment optical coherence tomography (AS-OCT) and ultrasonic pachymetry (UP).
METHOD: A prospective, observational and cross-sectional study was performed. The central corneal thickness was measured in 112 eyes of 112 consecutive patients with AS-OCT and UP. All examinations were performed by the same examiner. The measurements obtained between the 2 instruments were compared to assess the level of agreement.
RESULTS: The average corneal thickness value obtained by AS-OCT was 531.47 ± 26.23 μm, while that measured by UP was 532.51 ± 26.04 μm. The intraclass correlation coefficient was 0.957 (P <.001). The Student's t-test did not show a statistically significant difference (1.04 ± 7.70 μm, P =.158). Finally, the Bland-Altman analysis showed a high level of agreement between 2 methods of measurement.
CONCLUSIONS: In the context of normal corneas, there was good agreement between the measurement of central corneal thickness with AS-OCT and UP, although there was a slight overestimation of the measurement using UP (1.04 μm).
METHOD: A prospective, observational and cross-sectional study was performed. The central corneal thickness was measured in 112 eyes of 112 consecutive patients with AS-OCT and UP. All examinations were performed by the same examiner. The measurements obtained between the 2 instruments were compared to assess the level of agreement.
RESULTS: The average corneal thickness value obtained by AS-OCT was 531.47 ± 26.23 μm, while that measured by UP was 532.51 ± 26.04 μm. The intraclass correlation coefficient was 0.957 (P <.001). The Student's t-test did not show a statistically significant difference (1.04 ± 7.70 μm, P =.158). Finally, the Bland-Altman analysis showed a high level of agreement between 2 methods of measurement.
CONCLUSIONS: In the context of normal corneas, there was good agreement between the measurement of central corneal thickness with AS-OCT and UP, although there was a slight overestimation of the measurement using UP (1.04 μm).
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