A pterygium is a non-cancerous growth of the clear, thin tissue (conjunctiva) that lays over the white part of the eye (sclera). In some cases, a pterygium can extend to the cornea. The cause is unknown, however statistic shows that it is more common in people with excess outdoor exposure to sunlight and wind. Pterygium is rare in children.

A painless area of raised white tissue, with blood vessels on the inner or outer edge of the cornea. Sometimes it can become inflamed, causing a burning and irritation sensation, or a feeling as though there is something foreign in the eye .

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