What treatments can remove the eye disease pterigium?

Depends on size. Unless the pterygium is progressing towards the pupil or inducing astigmatism, surgical removal is generally not advised because the rate of regrowth is high. Many times, symptoms can be treated by keeping the eye lubricated, using steroid drops if it becomes inflamed and protecting the eye from uv light and wind.
Pterygium. Pterygium:very common, abnormal growth of clear covering (conjunctiva) of white part of the eye (sclera) over the cornea (window of the eye). If severe and causing discomfort or red, it can be removed with surgery. It is generally benign. It is due to excess sun/UV exposure usually. Prevention is only remedy. Avoid sun (sunglasses, hat); avoid smoking. Natural rx info: see eyedoc2020.blogspot.com.