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Eye Health Library / Eye Exam & Diagnoses
A pterygium is a benign, triangular-shaped growth of the conjunctiva that grows onto the cornea. The conjunctiva is the thin clear layer of tissue that lies over the white of the eyeball. A pterygium is made up of collagen and fibrovascular tissue that grows from the conjunctiva and eventually advances onto the cornea (the clear window of the eye). Pterygia are more commonly located on the inner or medial portion of the eye (toward the nose).
The exact cause is unknown. However, it has been associated with excessive sun or UV exposure, wind, dust and sand exposure. As such, protecting your eyes from the elements can help slow the growth of a pterygium. Even though a pterygium is considered a benign growth of the eye, it can become an annoyance when it becomes irritated or inflamed. Should you notice any type of growth on the eye, it is important to have it properly diagnosed by your local doctor of optometry.
Normally there is no discomfort associated with a pterygium and it is asymptomatic; hence nothing is done for it. With mild to moderate pterygia, where the patient has symptoms, artificial tear supplements and/or mild anti-inflammatory drops can be used to minimize symptoms. If a pterygium becomes very large, irritated or encroaches toward the centre of the cornea, your doctor of optometry will refer you to an ophthalmologist to surgically remove the excess tissue. Unfortunately, even with complete removal, a pterygium can reoccur.
As a pterygium grows over the surface of the cornea and towards the centre of the eye, it becomes more problematic. Patients will notice that their eye constantly feels irritated and there may be a foreign body sensation. The pterygium may also become more cosmetically noticeable.