A pterygium is a fleshy triangular tissue that grows over the cornea, usually on the inner corner of the eye. Sometimes, it grows big enough that it interferes with vision. As the pterygium develops, it may alter the shape of the cornea, causing astigmatism.
The exact cause of pterygia isn't known, but it's thought to be linked to:
Chances are, you'll notice a pterygium. Your eye doctor can also diagnose it during a routine eye exam.
Eye drops or ointment can be used to reduce the irritation caused by a pterygium. If the pterygium grows toward the central cornea,it may need to be removed surgically. Prevention is important. It's a good idea to protect your eyes with sunglasses if you'll be in the sun or a dusty, dry environment.
Photo courtesy of N. Friedman, M.D.
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