Skip to content
calendario Book an appointment

Eye diseases


Foto Patologia
It is a benign lesion, although it can grow and interfere with vision.
It is particularly common between the ages of 20 and 50, in rural and warm areas.
Protecting yourself from the sun is the main preventative measure against pterygium.

What is pterygium?

Pterygium is an overgrowth of the conjunctiva (membrane that covers the sclera, the white part of the eyeball) in such a way that it “invades” the cornea (transparent layer that acts as the front lens of the eye). It tends to be triangular in shape and usually occurs in the nasal area or inside the eye, although it can also affect the temporal area or both.

Although it is a benign lesion, its gradual growth can cause it to get large enough to interfere with vision.


Especially in the early stages, pterygium may go unnoticed, and you may not notice anything. However, as it develops, becomes inflamed or the adjacent cornea dries out due to poor tear film distribution.

A burning sensation is also frequent, as well as the loss of visual acuity, when the invasion of tissue alters the curvature of the cornea, hence causing astigmatism, or even partially or totally covers the visual axis.

Causes and risk factors