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. 2017 Jun 13;17:89. doi: 10.1186/s12886-017-0484-5

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© The Author(s). 2017

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. 4 — Panels (a, b, c, d: Unilateral comparison retinal photographs taken with the DEC200 hand-held portable fundus camera; and Panels (e, f, g, h): Unilateral comparison retinal photographs taken with a commercial TopCon TRC-NW8 camera. The four grading categories of image clarity: (a, e) excellent; (b, f) good; (c, g) fair; and (d, h) inadequate