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The main symptom of a pterygium is a painless area of raised white tissue, with blood vessels on the inner or outer edge of the cornea. Sometimes it may become inflamed and cause burning, irritation, or a feeling like there's something foreign in the eye.
A physical examination of the eyes and eyelids confirms the diagnosis. Special tests are usually not needed.
Farjo QA, Sugar A. Pterygium and conjunctival degenerations. In: Yanoff M, Duker JS, eds. Ophthalmology. 3rd ed. St. Louis, MO: Mosby Elsevier; 2008:chap 4.9.
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