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. 2020 Jul 21;10:12056. doi: 10.1038/s41598-020-68859-6

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© The Author(s) 2020

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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The trend in myopia progression of one subject fitted with the Gompertz function (solid line). The filled circle represents the SER at enrolment, while open circles represent the retrospective and prospective SER. The slope of the tangential line (red line) at enrolment is the first derivative of the Gompertz function (dashed line), which represents the rate of myopic progression at enrolment.