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Blinding ptergium: Pterygium that leads to blindness.

Pterygium

Pterygium is a growth of wing-shaped mass on the mucous membrane, conjunctiva of the eye. The mass grows from nasal side of the eye and overlaps the cornea. A pterygium usually doesn’t cause problems or require treatment, but it can be removed if it interferes with your vision.

What causes it?

The cause of pterygium is not known. Exposure to UV rays is said to be the cause of growth. It happens in people who live in warm climates and spend a lot of time outdoors in windy and sunny environment. The people prone to things like pollen, sand, dust, and smoke are at high risk.

Symptoms

People with pterygium have redness, blurry vision, itching, Foreign-body sensation, and eye irritation. Sometimes it can grow bigger to cover the whole pupil. Contact lens cannot be worn if you have big pterygium. 
Ptergium at its early stage only needs lubricating and anti-inflammatory eye drops. Needs surgical removal if it encroaches cornea which can create opacity in the cornea.

How is the diagnosis made?

Eye Doctors use this eye examination machine called slit lamp. Slit lamp helps doctors to see the presence of pterygium with the magnification seen through the slit lamp.

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