Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs PterygiumUpdated: 2017-06-13OverviewA pterygium is a noncancerous, triangular growth that may occur on one or both eyes. It's more common in people who spend a lot of time in the sun, such as people who work outdoors. SymptomsThe painless growth may be slightly raised and contain obvious blood vessels. It may cause irritation and possibly affect vision. TreatmentsTreatment usually isn't necessary. Eyedrops or surgery may help in severe cases. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use