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K. Mishima, A. Tomidokoro, P. Suramethakul, N. Mataki, N. Kurita, M. Araie; Iridotrabecular Contact Evaluated With Anterior-Segment Swept-Source Optical Coherence Tomography and Ultrasound Biomicroscopy in Narrow Angle Eyes. Invest. Ophthalmol. Vis. Sci. 2010;51(13):5532.
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© ARVO (1962-2015); The Authors (2016-present)
Ultrasound biomicroscopy (UBM) has been used for untouched evaluation of anterior chamber (AC) angle. Recently, anterior-segment swept-source optical coherence tomography (AS-SS-OCT) has become available for the same purpose. Compared with UBM, AS-SS-OCT can evaluate wider region of the AC in a shorter time with higher resolution. The aim of this study was to compare AS-SS-OCT with UBM for the evaluation of iridotrabecular contact (ITC), which consists of both peripheral anterior synechia (PAS) and appositional (functional) angle closure, in narrow angle eyes.
In 34 right eyes of 34 consecutive patients with shallow peripheral AC (2 or less with the van Herick method), gonioscopy and imagings of AC angle using AS-SS-OCT (SS-1000 CASIA, Tomey) with 128 radial scans centered on the corneal center and UBM (UD-6010, Tomey) with 4 line scans at the 12-, 3-, 6- and 9-o’clock positions were performed under dark and light conditions.
When using UBM, in PAS-negative quadrants, prevalence of ITC was highest in superiorly, then inferiorly, then nasally, and then temporally; and in total, ITC was found in 19 (16.1%) and 47 (39.8%) of the 118 PAS-negative quadrants under light and dark conditions, respectively. In PAS-positive quadrants, though the numbers were small, the prevalence of ITC did not differ among the four quadrants; and in total, ITC was found in 12 (66.7%) and 14 (77.8%) of the 18 PAS-positive quadrants under light and dark conditions, respectively. When using AS-SS-OCT, ITC was found in 110 (93.2%) of 118 PAS-negative quadrants under light condition and in all (100%) quadrants under dark condition. In PAS-positive quadrants, ITC was found in all (100%) quadrants under both light and dark conditions.
In narrow angle eyes, ITC was found in less than 40% of the PAS-negative quadrants with UBM, while in almost all quadrants with AS-SS-OCT, suggesting a superior performance of AS-SS-OCT for untouched evaluation of peripheral AC configurations.
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