1. Allergic conjunctivitis : Causes, incidence, and risk factors  (Trust Mark: Doctor-Reviewed)
When your eyes are exposed to anything to which you are allergic, histamine is released and the blood vessels in the conjunctiva become swollen (the conjunctiva is the clear membrane that covers the "white" of the eye. Reddening of the eyes develo...• Reviewer: Paul B. Griggs, MD, Department of Ophthalmology, Virginia Mason Medical Center, Seattle, WA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

2. Conjunctivitis  (Trust Mark: Doctor-Reviewed)
Conjunctivitis is swelling (inflammation) or infection of the membrane lining the eyelids (conjunctiva.• Reviewer: Linda Vorvick, MD, Family Physician, Seattle Site Coordinator, Lecturer, Pathophysiology, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.