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. 2023 Jul 24;13:11904. doi: 10.1038/s41598-023-38845-9

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© The Author(s) 2023

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Thickness map analysis of the healthy choroid using enhanced-depth imaging of widefield swept source optical coherence tomography. (A) The grid for measuring changes in the wide-field choroidal thickness. It comprises nine subfields divided by three circles with diameters of 3, 9, and 18 mm, respectively, and four lines. Circumferential and zonal areas enclosed by these circles are divided into superotemporal, inferotemporal, superonasal, and inferonasal subfields, with consideration of the arrangement of the vortex veins. (B) Infrared scanning laser ophthalmoscopy images overlaid with the measurement grid. (C) A choroidal thickness map. (D) Choroidal thickness values measured using the grid. The value for each subfield represents the mean choroidal thickness (μm) of the subfield. (E) Automatic segmentation of the inner and outer borders of the choroid is performed accurately.