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. 2022 Jan 19;12:992. doi: 10.1038/s41598-022-04784-0

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© The Author(s) 2022

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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Split view iris camera view and radial corneal-scleral scans. (a) Composite “split view” iris image after optimum instrument alignment. Iterative adjustments in the transverse and axial direction center the image and align the top and bottom halves, placing the iris in the center of the OCT scan field and at correct axial working distance. (b)–(d) 20-mm OCT B-scans from 3 meridians indicated in (a), respectively. Accurate alignment is especially important for biometry applications.