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. 2020 Mar 3;7:10. doi: 10.1186/s40662-020-00179-2

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© The Author(s) 2020

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — The changes in uncorrected distance visual acuity (UDVA) and best spectacle-corrected visual acuity (BSCVA) shown as percentages of lines gained/lines lost. Changes in UDVA after 12 months in the CXL-Plus group (a) and in the CXL group (b) and after 24 months in the CXL-Plus group (c) and in the CXL group (d) respectively. Changes in BSCVA after 12 months in the CXL-Plus group (e) and in the CXL group (f) and after 24 months in the CXL-Plus group (g), and in the CXL group (h) respectively. CXL = Corneal cross-linking, CXL-Plus = Central corneal regularization combined with CXL