Pink eye (conjunctivitis) is an inflammation or infection of the transparent membrane (conjunctiva) that lines your eyelid and covers the white part of your eyeball. When small blood vessels in the conjunctiva become inflamed, they're more visible. This is what causes the whites of your eyes to appear reddish or pink.
Pink eye is commonly caused by a bacterial or viral infection or an allergic reaction. It may affect one or both eyes.
Pink eye can be irritating, but it rarely affects your vision. Treatments can help ease the discomfort of pink eye. Because pink eye can be contagious, early diagnosis and treatment can help limit its spread.
July 16, 2015
- Jacobs DS. Conjunctivitis. http://www.uptodate.com/home. Accessed May 6, 2015.
- Ferri FF. Conjunctivitis. In: Ferri's Clinical Advisor 2015: 5 Books in 1. Philadelphia, Pa.: Mosby Elsevier; 2015. https://www.clinicalkey.com. Accessed May 15, 2015.
- Pinkeye. U.S. National Library of Medicine, National Institutes of Health. http://www.nlm.nih.gov/medlineplus/pinkeye.html. Accessed May 6, 2015.
- Conjunctivitis summary benchmarks for Preferred Practice Pattern guidelines. American Academy of Ophthalmology. www.aao.org. Accessed May 6, 2015.
- Azari AA, et al. Conjunctivitis: A systematic review of diagnosis and treatment. JAMA. 2013;310:1721.
- AskMayoExpert. Conjunctivitis. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2015.
- Yanoff M, et al., eds. Conjunctivitis: Infectious and noninfectious. In: Ophthalmology. 4th ed. Edinburgh, U.K.: Mosby Elsevier; 2014. https://www.clinicalkey.com. Accessed May 6, 2015.
- Conjunctivitis. American Academy of Ophthalmology. www.geteyesmart.org/eyesmart/diseases/pink-eye-conjunctivitis.cfm. Accessed May 19, 2015.
- Conjunctivitis. Centers for Disease Control and Prevention. www.cdc.gov/conjunctivitis. Accessed May 19, 2015.
- Robertson DM (expert opinion). Mayo Clinic, Rochester, Minn. May 30, 2015