spastic entropion

spastic entropion,

entropion that arises from excessive contracture of the oricularis oculi muscle. See also entropion.

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entropion

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

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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.