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Pterygium

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A pterygium is a condition in which a fold of connective tissue (conjunctiva) grows over the cornea. A pterygium usually starts on the nasal side of the eye and grows in a triangular shape from there towards the centre of the cornea. It is a fairly common condition.

 

Causes

Up to now, no clear cause has ever been identified. Both hereditary and environmental factors may play a role. In any case, UV light seems to be an important factor in its occurrence, as pterygium is more common in sunny climates and people who work a lot in the open air are also at greater risk of pterygium. In addition, chronic irritation of the eyes due to a dry, dusty environment seems to play a role.

Symptoms

A pterygium doesn’t necessarily cause any symptoms. However, it can cause the following complaints:

  • Chronic eye irritation, burning sensation
  • Redness of the eye on the side of the pterygium
  • Reduced visibility due to:
    • the pterygium growing over the centre of the cornea (facial axis)
    • the tear film being unable to spread evenly over the cornea and becoming unstable due to the pterygium
    • the pterygium changing the curvature of the cornea

Examination

The eye and the cornea are first examined in detail to make a proper diagnosis and draw up a treatment plan. In addition to the standard examinations, the following ones are specifically important in the case of a (possible) pterygium:

  • Eye measurement and visual acuity measurement
  • Split-lamp examination
  • Corneal tomography
  • Sometimes some tissue has to be carefully taken for pathological examination.

Treatment

Eye drops or ointment may be prescribed to reduce the burning sensation in the eye. However, if the pterygium grows so far over your cornea that your vision is impaired, the pterygium can be surgically removed (pterygium excision).

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