from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An abnormal mass of tissue arising from the conjunctiva of the inner corner of the eye that obstructs vision by growing over the cornea.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An abnormal mass of tissue in the corner of the eye that obstructs vision
from the GNU version of the Collaborative International Dictionary of English
- n. A superficial growth of vascular tissue radiating in a fanlike manner from the cornea over the surface of the eye.
from The Century Dictionary and Cyclopedia
- n. In zoology and anatomy, a limb or member of one of the vertebrates, as a fish, in the most general sense, without reference to its specialization in any given instance.
- n. In pathology, a more or less triangular patch of hypertrophied conjunctiva and subconjunctival tissue with its apex at the edge of the cornea or upon the cornea.
- n. In entomology, one of the two lateral expansions at the end of the rostrum of certain weevils. They lie above and partly conceal the scrobes or grooves in which the antennæ are concealed.
- n. An instrument employed in the operation for the removal of a pterygium from the cornea.
- n. A forward growth of the eponychium over the nail-plate.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea; it arises from irritation of the pinguecula
If the pterygium starts to grow over the cornea, it can blur or obstruct vision and may need to be removed.
An opthamologist explains that “cataracts and pterygium are common in Costa Rica, in part because of the strong sun.”
Sun exposure has also been linked to an abnormal growth on the corner of the eye near the nose called a pterygium.
Other potential eye health problems related to UV exposure include pterygium – a growth on the white of the eye, which encroaches onto the cornea and can obscure your vision.
Yes, besides eye cataracts, pterygium and pinguecula caused by the light of fluorescent bulbs.
Unfortunately, after surgery a pterygium often grows back again.
Dark glasses may help calm irritation and slow the growth of a pterygium.
Connected with diseases of the eye, pterygium is common; not only single, but double, triple, and even quadruple are occasionally met with.
The pelvic girdle and limb (Figure 2, Sheet 15) are similar in structure, but the pro-pterygium and meso-pterygium are absent, and the cartilage answering to the meta-pterygium goes by the name of the basi-pterygium.
Three main cartilages, named respectively the pro - (p.p.), meso - (m.p.), and meta-pterygium, form the base of the limb.