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. 2017 May 31;7:2529. doi: 10.1038/s41598-017-02851-5

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© The Author(s) 2017

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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Correlation and statistical significance analysis between all parameters measured during the data collection. Pearson’s correlation coefficient values (r²) are displayed in each bin. The color map shown below correspond to the r² and p values. NPC: near point of convergence, RPC: recovery point of convergence, BO: base-out vergence range, BI: base-in vergence range, CISS: convergence insufficiency symptom survey score, RPA: rate of phoria adaptation, Mag: magnitude of change in phoria, Baseline: Before wearing PALs, Post One month after wearing PALs. Positive correlation is denoted in red and negative correlation is denoted in blue. Data are from Experiment 2 studying incipient presbyopes.