RT Book, Section A1 Lueder, Gregg T. A2 Rudolph, Colin D. A2 Rudolph, Abraham M. A2 Lister, George E. A2 First, Lewis R. A2 Gershon, Anne A. SR Print(0) ID 7060122 T1 Chapter 589. Lid and Lacrimal System Disorders T2 Rudolph's Pediatrics, 22e YR 2011 FD 2011 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-149723-7 LK accesspediatrics.mhmedical.com/content.aspx?aid=7060122 RD 2024/04/25 AB The eyelids play an important role in maintaining ocular health and good vision. The mechanical action of the eyelids sweeping over the globe brings in fresh, lubricating tears and removes debris. The edge (margin) of the two upper eyelids and two lower eyelids should be symmetric. The upper eyelid margin should rest at the superior edge of the cornea or just over the superior iris, so as not to block any visual input. The eyelid margins normally rest against the globe, and the eyelashes are directed outward.