ABSTRACT NUMBER - 117

SWEPT SOURCE OCT EN-FACE IMAGING OF VITREOUS CAVITY REVEALS THE TOPOGRAPHIC RELATIONSHIP OF THE PREMACULAR BURSA, CLOQUET’S CANAL, PREVASCULAR VITREOUS FISSURES, LACUNAE AND CISTERNS


Belinda Leong1,2,3, Serena Fragiotta1,4,2,3, Talia Kaden1,3,5, K. Bailey Freund1,3,2, Michael Engelbert1,3,2

Meeting:  2018 RANZCO


SESSION INFORMATION

Date:      -

Session Title: POSTER ABSTRACT- RETINA

Session Time:      -

Purpose: To examine the posterior vitreous of healthy subjects using Swept-Source Optical Coher- ence Tomography (SS-OCT) and characterize the topographic relations of the premacular bursa, prevas- cular vitreous fissures (PVFs), lacunae and cisterns.
Methods: PLEXTM Elite 9000 SS-OCT (Carl Zeiss Meditec) was used to acquire 12 × 12 mm (1024 × 1024) cube scans. 37 eyes of healthy subjects aged 7.2-35.5 years old with an axial range of 23.0-26.6 mm were examined. Vitreous scans were segmented parallel to the vitreoretinal interface. En- face and cross-sectional images were correlated.
Results: En-face and cross-sectional B-scans con- firmed that, in the majority (97.3%) of patients, the premacular bursa and prepapillary gap connect at a variable distance from the optic nerve superiorly and follow a common course anteriorly in a supero- nasal direction. The course of prevascular fissures (PVFs) could be determined with respect to the appearance and structure of cisternal spaces. The morphology of and differences between cisterns and lacunae were also characterized. Degenerative, eyewall-parallel fissure planes and their course are described for the first time in a three-dimensional manner. In a small number of patients (37.8%), these fissure planes were noted to arise from PVFs with a significantly different morphology.
Conclusions: The en-face vitreous SS-OCT scans obtained are of unprecedented resolution and depth and unequivocally reveal the topographic relation- ships of vitreous hyporeflective spaces. They confirm the anterior course of the premacular bursa and Clo- quet’s canal and the connection between the two.

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