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

STYE
A stye is a small, pus-filled swelling at the base of an eyelash, which may cause pain when blinking. It is usually due to a bacterial infection.
A stye typ...

SUBCONJUNCTIVAL HEMORRHAGE
A subconjunctival hemorrhage is bleeding under the conjunctiva (the clear membrane covering the white of the eye), producing a dark red area over the white of t...

TINNITUS
Tinnitus is the term for noises such as buzzing, ringing, or hissing that originate within the ear rather than externally. It is commonly associated with hearin...

TRACHOMA
Trachoma is an infectious eye disease caused by the bacterium Chlamydia trachomatis. Although rare in developed countries, it is a major cause of visual impairm...

UVEITIS
Uveitis is inflammation of any part of the uvea, which comprises the iris (the colored part of the eye), ciliary body (a ring of muscle behind the iris), and ch...

VERTIGO
Benign paroxysmal positional vertigo People with vertigo have the sensation that they or their surroundings are spinning or tilting, which produces unsteadiness...

VESTIBULAR NEURITIS
Also known as vestibular neuronitis, vestibular neuritis is inflammation of the vestibular nerve in the inner ear, usually as a result of a bacterial or viral i...

XANTHELASMA
Xanthelasmas are yellowish deposits of fatty material around the eyes. They are common in older people and are harmless, although they can be removed by surgery...