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. 2018 May 7;2(2):21. doi: 10.3390/vision2020021

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The graph reports the average ratings (N = 26) on a 7-point Likert scale for each photograph: Natural (NP), Fisheye (FP) and Linear (LP). Standard errors are represented in the figure by the error bars attached to each column.