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Offset of openings in optic nerve head canal at level of Bruch’s membrane, anterior sclera, and lamina cribrosa
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Offset of openings in optic nerve head canal at level of Bruch’s membrane, anterior sclera, and lamina cribrosa
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Journal Article
Offset of openings in optic nerve head canal at level of Bruch’s membrane, anterior sclera, and lamina cribrosa
2021
Overview
We compared the central retinal vascular trunk (CRVT) position, as a surrogate of lamina cribrosa (LC) offset, with the anterior scleral opening (ASCO) offset from the Bruch’s membrane opening (BMO). Based on the BMO-centered radial scans, the BMO and ASCO margins were demarcated, and each center was determined as the center of the best-fitted ellipse for each margin. The ASCO/BMO offset was defined as the offset between each center. Angular deviations and the extent of ASCO and CRVT offsets from the BMO center were compared directly. Incomplete demarcation of ASCO was found in 20%, which was associated with a larger BMO area and a larger ASCO offset from the BMO. The angular deviation of ASCO offset was associated with that of CRVT offset and that of the longest externally oblique border. The ASCO offset was smaller than the CRVT offset, and, unlike the CRVT offset, it was rarely deviated to the inferior side. The complete ASCO margin might not be demarcatable when determined on BMO-centered radial scans in the presence of an offset. Also, the ASCO, which reflects only the superficial scleral layer, might not reflect the LC position, because the LC might be shifted further from the ASCO.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
