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I. M. Rozenbaum, Z. Sbeity, C. Tello, J. M. Liebmann, R. Ritch; Slit-Lamp Adapted Optical Coherence Tomography (SL-OCT) of Schlemm’s Canal After Canaloplasty. Invest. Ophthalmol. Vis. Sci. 2008;49(13):5092.
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Canaloplasty is a nonpenetrating glaucoma surgical procedure during which a tensioning polypropylene suture is used to permanently dilate Schlemm's canal and distend the trabecular meshwork to increase aqueous humor outflow. We assessed the ability of SL-OCT, a non-contact, infrared light-based technology, to show canalicular dilation and meshwork distension after canaloplasty.
Six consecutive patients underwent uncomplicated canaloplasty (2 combined with clear corneal phacoemulsification with lens implantation). All eyes were imaged with SL-OCT between 1 and 4 days post-operatively. Radial SL-OCT images were obtained at 1:30, 3, 4:30, 6, 7:30, 9:00, 10:30, and 12:00 o'clock positions. All images were reviewed by 2 experienced masked observers.
SL-OCT images showed canalicular dilation in 6/6 (100%) cases and trabecular distension in 4/6 (66.7%) cases and no distension in 2/6 (33.3%) cases. Hyporeflective microfiltration spaces were seen over the scleral flap in 4/6 (66.7%) cases.
SL-OCT is a useful modality for visualizing Schlemm’s canal and trabecular distension in the early postoperative period after canaloplasty. Additional larger, controlled studies to demonstrate a relationship between canalicular dilation and meshwork distension and IOP are needed.
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