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Abstract #27290 Published in IGR 12-4
Intra-examiner repeatability and agreement of corneal pachymetry map measurement by time-domain and Fourier-domain optical coherence tomography
Huang J-Y; Pekmezci M; Yaplee S; Lin SGraefe's Archive for Clinical and Experimental Ophthalmology 2010; 248: 1647-1656
Background: To assess the intra-examiner repeatability and agreement of corneal pachymetry maps measured by time-domain (Visante OCT) and Fourier-domain optical coherence tomography (RTVue OCT). Methods: This observational cross-sectional study enrolled 72 eyes from 72 volunteers. Only one eye of each patient was chosen randomly to receive repeated scanning with both devices by the same examiner, in order to test the intra-observer repeatability. The first scan by each device from all enrolled eyes was used to analyze the difference and agreement between the two devices. The agreement between the two devices was analyzed by the Bland-Altman method. Intra-observer repeatability of each OCT device was analyzed by intra-class correlation (ICC). Results: The mean corneal thickness of the central 2 mm zone was 524.3(plus or minus)35.7 (mu)m and 525.4(plus or minus)35.3 (mu)m by the Visante OCT and the RTVue OCT respectively (p=0.089). The intra-observer repeatability of the RTVue OCT (ICC=0.994) was superior to that of the Visante OCT (ICC=0.989) in the central 2 mm zone. However, the intra-observer repeatability of the RTVue OCT in the pericentral 2 to 5 mm zone was not superior to that of the Visante OCT. Both OCT devices had similar repeatability in the pericentral 2 to 5 mm zone [ICC of the Visante OCT=0.991; 95% confidence interval (CI) 0.986-0.995), ICC of the RTVue OCT=0.991; 95% CI 0.985-0.994)). Conclusions: The difference in CCT measurement by the Visante OCT and the RTVue OCT is probably too small to influence clinical decision making for refractive surgery and glaucoma management. The RTVue OCT demonstrated better intra-observer repeatability in the central 2 mm zone, which probably was related to its rapid image acquisition capability. (copyright) 2010 Springer-Verlag.
S. Lin. Department of Ophthalmology, University of California, San Francisco, 10 Koret Way K325, San Francisco, CA 94143-0730, United States. LinS@vision.ucsf.edu
Classification:
6.9.2.1 Anterior (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis > 6.9.2 Optical coherence tomography)
2.2 Cornea (Part of: 2 Anatomical structures in glaucoma)
