Optic Disc Morphometry with Optical Coherence Tomography. Comparison with Scanning Laser Tomography
Schubert K. V. B., Kamppeter B., Degenring R., Budde W. M.
Augenklinik, Fakultät für Klinische Medizin Mannheim der Ruprecht-Karls-Universität Heidelberg, Mannheim
Purpose: To compare morphometric optic disc measurements obtained by optical coherence tomography and by scanning laser tomography.
Method: Thirty-three eyes of 22 Caucasian subjects (12 female and 8 male patients) were included. Mean age was 59.6 ± 16.8 years (mean ± SD), mean refractive error was 1.3 ± 2.4 D. All eyes underwent optic disc assessment by optical coherence tomography (OCT3, Carl Zeiss Ophthalmic Systems-Humphrey Division, Dublin, CA, USA). Six cross-sectional scans of the disc were obtained in differing meridians. Of the six scans, morphometric data of the optic disc were computed. Of all eyes, 3 scanning laser tomographic images were obtained (HRT II, Heidelberg Engineering, Dossenheim, Germany) and morphometric data of the optic disc were computed.
Results: Correlation coefficient (Pearson) for the two methods was R = 0.64 (P<0.0001) for the disc size, R = 0.60 (P<0.0001) for the cup size and R = 0.17 (P=0.33) for rim area. In 5 eyes displaying a small disc without cupping, the OCT3 measured a total cupping without rim. After correction for this artifact, correlation coefficient for cup area was R = 0.91 (P<0.0001) and for rim area R = 0.48 (P=0.004).
Conclusions: Morphometric optic disc measurements obtained by OCT3 correlate well with those of an established metho
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