causes of pterygium
The primary cause of pterygium is cumulative UV radiation, typically from sun exposure. Dry, windy, and dusty conditions can also contribute to its growth.he primary cause of pterygium is cumulative UV radiation, typically from sun exposure. Dry, windy, and dusty conditions can also contribute to its growth.
Sometimes, a pterygium causes no symptoms other than its appearance. An enlarging pterygium, however, may cause redness and inflammation. A pterygium can progressively grow onto the cornea (the clear, outer layer of the eye).This can distort the shape of the cornea, causing a condition called astigmatism.The result can be blurred vision.n enlarging pterygium, however, may cause redness and inflammation. A pterygium can progressively grow onto the cornea (the clear, outer layer of the eye). This can distort the shape of the cornea, causing a condition called astigmatism. The result can be blurred vision.