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. 2017 Nov 20;2(6):e629. doi: 10.1097/PR9.0000000000000629

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Copyright © 2017 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the International Association for the Study of Pain.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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Figure 1. — Frequencies of tear film dysfunction in each age group of veterans seen in the VA Healthcare System between January 1, 2010, and December 31, 2014. Total number of veterans in the study n = 3,265,894. VA, Veterans Affairs.