Will pterygium causeyour vision to be blurry?

Maybe: In the early stage, it usually does not affect vision. In the later stages it can cause an extreme change or distortion in vision, typically inducing astigmatism.

Certain Cases: On occasion, some pterygia can become red and swollen. Large and advanced pterygia can actually cause a distortion of the surface of the cornea (called “corneal scarring”), inducing astigmatism. This means that the pressure of the pterygium causes the normal spherical shape of cornea to change, making it more difficult for your eyes to focus.

Yes: Pterygium: common, abnormal growth of clear covering (conjunctiva) of eye's white part (sclera) over the cornea (window of the eye). If severe & causing discomfort or red, it can be removed w/ surgery. It is generally benign. It is due to excess sun/UV exposure. Prevention is key remedy. Avoid sun (sunglasses, hat); avoid smoking. For more info: eyedoc2020.blogspot.com

Usually not: Most pterygiua are in the periphery of the cornea away from the central axis of light and vision. So if you have a pterygium, and central blur, it is probably from another cause. Only if the pterygium grows close to the center of the cornea will there be some blur and this is quite uncommon.