Pronounced: TER ige e em
By Catherine Duffek, MLS, MS
A pterygium is an abnormal, noncancerous growth of the conjunctiva. The conjunctiva is a thin membrane lining the inside of the eyelid and part of the eyeball. It is located between the sclera, or the "white of the eye" which surrounds the eyeball, and the cornea, the dome-shaped window covering the front of the eye which is responsible for the refraction of light. If a pterygium continues to grow, it may spread onto the cornea.
Excessive growth of the conjunctiva leads to a pterygium. The exact cause of pterygium is unknown.
Pterygium is more common in men and in those of increasing age. Other factors that may increase your chance of pterygium include:
The symptoms of pterygia vary from person-to-person. It appears as a fleshy spot—whitish in color and containing blood vessels—extending onto the surface of the eye. In some people, pterygia remain small and do not affect vision. These pterygia are noticed only because of their abnormal cosmetic appearance. In other people, pterygia grow quickly and large enough to eventually distort the corneal surface and cause severely blurred vision. Pterygia do not cause pain.
Pterygium may cause:
You will be asked about symptoms and medical history. An eye exam will be done.
Tests may include the following:
The main goals of treating a pterygium are to:
Treatment options include:
Your doctor will schedule periodic eye exams to monitor the pterygium. If symptoms increase, additional treatments may include:
Medications to treat pterygium may include:
If vision becomes severely blurred, the pterygium may need to be surgically removed. This is commonly done on an outpatient basis. On occasion, a pterygium can return. Steps may be taken during the operation to prevent this from happening.
In rare cases, a pterygium causes serious scarring of the cornea. If this happens, a corneal transplant may be needed. Once the pterygium has been surgically removed, medication may be used to aid in healing and prevent recurrence.
To help reduce your chance of pterygium:
American Optometric Association
Eye Smart—American Academpy of Ophthalmology
Canadian Ophthalmological Society
Facts About the Cornea and Corneal Disease. National Eye Institute website. Available at: https://nei.nih.gov/health/cornealdisease/. Updated May, 2016. Accessed December 15, 2017.
Pterygium. Digital Journal of Ophthalmology website. Available at:
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Updated October 15, 2002. Accessed December 15, 2017.
Pterygium. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T920562/Pterygium . Updated December 5, 2017. Accessed December 15, 2017.
Pterygium. Kellogg Eye Institute, University of Michigan website. Available at:
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Accessed December 15, 2017.
What Is a pinguecula and a pterygium? American Academy of Ophthalmology Eye Smart website. Available at: https://www.aao.org/eye-health/diseases/pinguecula-pterygium. Updated September 1, 2017 Accessed December 15, 2017.
Last reviewed November 2018 by EBSCO Medical Review Board Michael Woods, MD, FAAP
Last Updated: 12/20/2014
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