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. 2018 Feb 1;8:2172. doi: 10.1038/s41598-018-20480-4

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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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SNR for each stimulus form, for three strata of disease severity, lower, middle and upper percentiles (according to TD with the GIII stimulus, same strata as in Fig. 4. Boundaries between strata indicated in both log energy, and HFA II-equivalent sensitivity), for (a) complete and (b) matched data, pooled across all four visual field locations. Sample size (n) is given below each box. The y-axis in (b) is scaled up for ease of data visualisation.