An early classification scheme of meibomian gland disease from Foulks and Bron7 included presentations other than MGD, and separated MGD into high- and low-delivery states. Reprinted with permission from Foulks GN, Bron AJ. Meibomian gland dysfunction: a clinical scheme for description, diagnosis, classification, and grading. Ocul Surf. 2003;1:107–126. © Ethis Communications, Inc.