Pterygium is a growth of fleshy tissue (has blood vessels) that may start as a pinguecula. It can remain small or grow large enough to cover part of the cornea. When this happens, it can affect your vision.

Pterygium is believed to be caused by a combination of exposure to ultraviolet (UV) light from the sun, wind and dust.

Avoiding pterygium

lf you have had a pinguecula or a pterygium at least once before, try to avoid the things that cause these growths. Here are some ways:

wear sunglasses to protect your eyes from ultraviolet (UV) light
protect your eyes from dust by wearing glasses or goggles
use artificial tears when your eyes are dry