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. 2018 Jun 15;8:9177. doi: 10.1038/s41598-018-27480-4

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© The Author(s) 2018

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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Entire data set for the 3 observers, with fits from model #5. The top row shows AO results, while the bottom row shows low-order optical correction. 95% confidence intervals are shown for unflanked trials (rightmost squares), representative of confidence intervals for the other data points. Colors indicate the size of a stroke, as indicated in the figure legends. Lines and shaded regions show model fits and 95% confidence intervals for each optotype size, which have been inverse transformed from the probit model. Triangles near each function indicate the fitted critical spacings for a reduction of 2.5% accuracy performance.