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A. Katsanos, G. Labiris, A. Fotiadou, M. Fanariotis, P. Makris, D. Chatzoulis; STRATUS OCT for Anterior Chamber Imaging: Intra- and Interobserver Reproducibility. Invest. Ophthalmol. Vis. Sci. 2008;49(13):614. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
To examine the reproducibility of anterior chamber measurements performed with STRATUS OCT, a device originally developed for posterior pole imaging.
Anterior chamber structures of seven eyes without any ophthalmic disease were scanned with a commercial STRATUS OCT unit after appropriate focus adjustments. A single operator performed all imaging. Three specialist ophthalmologists used the same images to measure pupil size, as well as maximum and minimum iris thickness on three consecutive days by means of the software-provided calliper. The examiners were masked to each others’ as well as their own previous results. Intra- and interobserver reproducibility was obtained by calculating the coefficient of variation (CV) of the results for each examiner in each eye and across all eyes.
Intraobserver reproducibility for each eye was high (CV<10%) except for the measurement of minimum iris thickness in one eye by two examiners (CV: 11.4% and 15.9%) and maximum iris thickness in another eye by the same two examiners (CV: 12.1% and 12.5%). Interobserver reproducibility for all eyes was high: CV for pupil size, thinnest and thickest iris measurements was 0.7%, 9.8% and 6.4% respectively. Intraobserver reproducibility for all eyes was also high: CV for pupil size, thinnest and thickest iris measurements was 0.5%, 6.2% and 4.3% respectively.
Imaging of the anterior chamber structures was possible with the commercial version of STRATUS OCT. Although some measurements of thickness and distance were technically undemanding and had good reproducibility, caution is needed when certain anatomic landmarks and structures are subjectively determined.
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