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The classification system described by Bron and Tiffany27 segregated the etiologies of meibomian gland disease into primary, secondary, and hypersecretory causes. Theirs was a unique presentation in its circular configuration. Reprinted with permission from Bron AJ, Tiffany JM. The contribution of meibomian disease to dry eye. Ocul Surf. 2004;2:149–164. © Ethis Communications, Inc.
