A pterygium is a wing-shaped thickening of the conjunctiva (the clear membrane covering the white of the eye) that starts on the side of the eye nearest the nose and extends inward toward the center.
One or both eyes may be affected. Pterygium is thought to be due to prolonged exposure to bright sunlight.
If it causes discomfort or threatens vision, a pterygium may be removed surgically.

Othere related diseases

ECTROPION AND ENTROPION
Ectropion is a turning outward of the lower eyelid. The eyelid’s exposed inner surface becomes dry and sore, and the eye may water continuously. Because the e...

EUSTACHIAN TUBE DYSFUNCTION
The Eustachian tube, running from the middle ear to the back of the nose, acts as a drainage tube and also regulates pressure in the middle ear. In Eustachian t...

FOCUSING PROBLEMS
Farsightedness Nearsightedness Astigmatism Focusing an image sharply on the retina (the light-sensitive layer at the back of the eye) depends mainly on the len...

GLAUCOMA
Normally, fluid is continually secreted into the front of the eye by a structure called the ciliary body to nourish the tissues and maintain the shape of the ey...

LABYRINTHITIS
Labyrinthitis is inflammation of the labyrinth of the inner ear, which contains the organs of hearing and balance. It is usually caused by a bacterial or viral ...

MACULAR DEGENERATION
Macular degeneration (also known as age-related macular degeneration, or AMD) is a deterioration of the macula, the central area of the retina responsible for s...

MENIERES DISEASE
Ménière’s disease is an inner ear disorder characterized by recurrent attacks of vertigo, tinnitus (ringing in the ear), and hearing loss. It is due to a bu...

OTITIS EXTERNA
In otitis externa, the outer ear canal becomes inflamed, usually due to a bacterial, viral, or fungal infection. It is sometimes called “swimmer’s ear,” b...