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. 2020 Aug 28;20:320. doi: 10.1186/s12883-020-01889-9

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 1 — Eye movements demonstrating right eye nuclear third nerve palsy. a Neutral position of eyes showing bilateral partial ptosis (right > left) and outward and downward deviation of the right eye due to third nerve palsy. b Attempted vertical gaze; vertical gaze palsy is apparent. c Right gaze; right eye abduction and left eye adduction is preserved. d Left gaze; right eye adduction is impaired whereas left eye abduction is preserved