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. 2024 Aug 16;24:349. doi: 10.1186/s12886-024-03609-0

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. 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-nc-nd/4.0/.

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Fig. 1 — Measurement parameters of UBM. (a) PCA, posterior chamber angle = the angle formed between the posterior surface of the iris root and the anterior aspect of the ciliary body. (b) CSR, width of the ciliary sulcus recess = the width of the recess formed on the posterior surface of the iris root and the anterior portion of the ciliary body. (c) HCP, height of ciliary processes = the distance from the tip to the base of the ciliary processes. (d) STS, ciliary sulcus to ciliary sulcus = inter-ciliary sulcal distance within the same meridional orientation; STSL, distance between the STS plane and anterior crystalline lens surface. (e) LD-ITC, linear distance from the posterior surface of the peripheral iris to the ciliary processes. Peripheral iris refers to the portion of the iris located 500 μm above the scleral spur along the corneal endothelium, measured as a straight line perpendicular to the anterior surface of the iris