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. 2020 Feb 27;104(12):1676–1682. doi: 10.1136/bjophthalmol-2019-315384

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Four images where (A) and (B) demonstrate presence and location of intraductal devices (maskin probe) within the central duct of an area lacking acinar-ductule units. (A) Probe within the central duct of whole gland atrophy lacking acinar-ductule units for whole gland. (B) Maskin probe within the central duct of proximal atrophy where the gland lacks acinar-ductule units proximal to areas of distal and mid-to-distal intact or faded acinar-ductule units (black lines parallel probe within central duct). (C) Microtube within the duct of a meibomian gland to retrieve meibum specimen. Note the forceps holding end of tube. (D) Microtube with retrieved meibum immediately after removal from gland.