Corneal diameter measurements by corneal topography and angle-to-angle measurements by optical coherence tomography: Evaluation of equivalence

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Abstract

Purpose: To determine the equivalence of corneal white-to-white (WTW) diameter and anterior segment angle-to-angle (ATA) measurements. Setting: Vissum Instituto Oftalmologico de Alicante, Alicante, Spain. Methods: Thirty eyes of 19 patients ranging in age from 20 to 51 years old with no previous ocular surgeries were included in this study. In all cases, the horizontal WTW diameter was measured with a tool provided by the CSO corneal topography system (Costruzione Strumenti Oftalmici) and the horizontal ATA was measured using an optical coherence tomography (OCT) system (Visante, Carl Zeiss Meditec AG). All measurements were repeated 3 times to evaluate intrasession repeatability. The correlation between WTW and ATA measurements was studied, and the interchangeability of the 2 parameters was assessed using the Bland and Altman method. Results: The mean corneal WTW diameter was 12.25 mm ± 0.49 (SD) (range 11.34 to 13.16 mm), and the mean ATA distance was 11.76 ± 0.52 mm (range 10.03 to 12.92 mm). The difference between the 2 parameters was statistically significant (P

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Piñero, D. P., Plaza Puche, A. B., & Alió, J. L. (2008). Corneal diameter measurements by corneal topography and angle-to-angle measurements by optical coherence tomography: Evaluation of equivalence. Journal of Cataract and Refractive Surgery, 34(1), 126–131. https://doi.org/10.1016/j.jcrs.2007.10.010

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