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. 2020 Jan 10;15:7. doi: 10.1186/s13023-019-1288-x

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© The Author(s). 2020

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 — a Infrared images of the everted lower eyelid highlight some rudimentary Meibomian gland ducts (white dots) in a representative male subject with XLHED. b more than 20 fully developed Meibomian gland ducts, extending from the lower tarsus to the orifices at the lid margin, in an age-matched healthy control