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. 2019 Dec 12;5(Suppl 1):23. doi: 10.1186/s40942-019-0173-z

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© The Author(s) 2019

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 — Comparison of conventional measurement of the angle of view and the angle used by the Optos system. Whereas the angle of view has traditionally referred to the angle at which light enters the eye, the Optos measures the angle from the center of the eye. The 200° from the center of the eye corresponds to approximately 125° measured in the conventional manner