entropion

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entropion

 [en-tro´pe-on]
inversion, or the turning inward, as of the margin of an eyelid.
entropion u´veae inversion of the margin of the pupil.

en·tro·pi·on

, entropium (en-trō'pē-on, -pē-ŭm),
1. Inversion or turning inward of a part.
2. The infolding of the margin of an eyelid.
[G. en, in, + tropē, a turning]

entropion

/en·tro·pi·on/ (en-tro´pe-on) inversion, or the turning inward, as of the margin of an eyelid.

entropion

[entrō′pē·on]
Etymology: Gk, en + tropos, a turning
turning inward or turning toward, usually a condition in which the eyelid turns inward toward the eye. In either the upper or lower eyelid, cicatricial entropion can result from scar tissue formation. Spastic entropion results from an inflammation or other factor that affects tissue tone. An inflammation of the eyelid may be the result of an infectious disease or irritation from an inverted eyelash. Compare ectropion. See also blepharitis.
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Entropion

entropion

Ophthalmology Inversion of the eyelid or, generically, any part with a free margin

en·tro·pi·on

, entropium (en-trō'pē-on, -ŭm)
1. Inversion or turning inward of a part.
2. The infolding of the margin of an eyelid.
[G. en, in, + tropē, a turning]

entropion

Inward curling of the margin of an eyelids so that the lashes tend to rub against the eye. In severe entropion there may be complete inversion of the lid, so that the lashes are hidden. Entropion can lead to ulceration of the CORNEA.

entropion

Inward turning of the eyelid. It results in the eyelashes rubbing the cornea (as in trichiasis) and this usually causes discomfort. The most common cause of entropion that occurs in old people (called involutional entropion) and only affects the lower eyelid is due to a combination of atrophy and weakening of the tarsus, loss of tone of the subcutaneous tissues and loss of elasticity of the skin. Other causes are scarring (e.g. trachoma, Stevens-Johnson syndrome), burns of the palpebral conjunctiva (called cicatricial entropion) which may affect either the upper or the lower eyelid, or spasm of the orbicularis muscle often resulting from an ocular inflammation or lid infection (called acute spastic entropion) which may subside spontaneously once the original cause has been removed. Temporary relief of entropion may be provided by the taping of the lower eyelid to the cheek but the treatment is usually surgical. See ectropion; therapeutic soft contact lens; orthopaedic spectacles; tarsus; trichiasis.
cicatricial entropion; involutional entropion See entropion.
congenital e . A rare congenital inversion of the eyelid usually associated with tarsal hypoplasia or microphthalmia. It may be confused with epiblepharon. If treatment is needed it is surgical, although many cases resolve spontaneously with time.

entropion (entrō´pēon),

n the inversion, or infolding, of the eyelid margin.

entropion

inversion, or the turning inward, as of the margin of an eyelid. Causes irritation, blepharospasm, keratitis. May be congenital or acquired.

anatomic entropion
see conformational entropion (below).
cicatricial entropion
caused by scarring of the eyelid or conjunctiva following injury or inflammation.
conformational entropion
a conformational feature of some dog breeds, including Shar peis, Chow Chows, and St. Bernards, which either have excessive and thick skin on the face, or deeply set eyes. Called also anatomic entropion.
geriatric entropion
occurs in older dogs because of temporal muscle atrophy, loss of retrobulbar tissue or general debilitation.
inherited congenital entropion
occurs in sheep, cattle, miniature pigs and some breeds of dogs.
lateral entropion
affects the lateral part of the eyelids. Involvement of both upper and lower eyelids may be caused by inadequate function of the retractor anguli oculi muscle.
medial entropion
seen most often in brachycephalic dogs.
neonatal entropion
seen in Shar pei puppies, because of their thick skin and enophthalmos. Temporary surgical correction is required at an early age. Newborn lambs, calves and goats may also be affected.
spastic entropion
due to spasticity of the orbicularis oculi muscle caused by painful conditions of the eye, such as ulcerative keratitis, distichiasis or foreign bodies.
uveal entropion, entropion uveae
infolding of the pupillary border and adherence to the anterior surface of the iris.