A pterygium is a wedge-shaped growth of thickened tissue that covers the white part of the eye. A pterygium typically starts growing near the inside of the corner of the eye. It often extends onto the cornea, towards the pupil. Both eyes can be affected. A pterygium may grow large enough to interfere with sight and can cause other annoying symptoms, it can safely be left alone.
Causes of a Pterygium: The exact cause is not know, although it is thought that it's more likely to develop in people who live in tropical climates, work outdoors and spends a lot of time in the sun.
Reasons for Surgical Removal
- Threat to normal vision
- Irritation, tearing and discomfort
- Development or increase of astigmatic error
- Redness or appearance
- Contact lenses interference