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. 2018 Jan 17;8:961. doi: 10.1038/s41598-018-19321-1

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Determination of the lamina cribrosa curvature index (LCCI) and juxtapapillary choroidal thickness (JPCT). (a) Sterescopic optic disc photograph image. (b,c) B-scan images obtained at superior midperiphery as shown in (a). (b) The LCCI was measured by dividing the lamina cribrosa (LC) curve depth (LCCD) within Bruch’s membrane (BM) opening by length of LC surface reference line (W), and then multiplying by 100. (c) Green solid lines indicate the upper and lower margins of the parapapillary choroid at the superior midperiphery, represented by BM and the choroidoscleral interface, respectively. The area of the juxtapapillary choroidal tissue within 500 μm from the border tissue of Elschnig was measured, and the mean was calculated by dividing the area by 500 μm.