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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. 2 — (a) Optical configuration of the prototype camera (distances between components are approximated). The components are specified as follows: (1) human eye, (2) front objective lens, (3) condensing lens, (4) visible light emitting diode (LED) unit and xenon flash tube, (5) macro lens. This configuration allows a reflection-free, 60° field–of-view of the fundus in an external housing that can be attached to an LCD monitor with a CMOS sensor that maintains hand-held, point-and-shoot operation. (b) Operation of the non-mydriatic portable fundus camera while screening retinal diseases