Also found in: Dictionary, Acronyms, Wikipedia.
congenital absence of the iris.
Absence of the iris. Compare: irideremia.
[G. an- priv. + irid- + -ia]
aniridia/an·irid·ia/ (an″ĭ-rid´e-ah) congenital absence of the iris.
Etymology: Gk, a, without + iris
an absence of the iris, a usually bilateral, hereditary anomaly. Often, a rudimentary stump is visible through a gonioscope.
aniridiaOphthalmology A congenital AD or AR condition characterized by a virtually complete absence of the iris, which may be accompanied by other ocular defects–eg, congenital cataracts, corneal dystrophy, foveal hypoplasia, and therapeutically refractory glaucoma Prognosis Poor
Absence of the iris.
aniridiaAbsence of the iris of the eye. This may be CONGENITAL or, more commonly, the result of injury.
Complete, or almost complete, absence of the iris of the eye. It can be acquired, due to trauma, or inherited as an autosomal dominant trait. The patient is photophobic and in congenital cases there is usually amblyopia and sometimes nystagmus. Contact lenses incorporating an artificial iris, or tinted spectacle lenses, help in this condition. See chromosome; irideremia; cosmetic contact lens.
congenital complete or partial absence of the iris. Occurs in Jersey calves as an autosomal recessive trait and causes visual impairment, ranging to blindness. May be associated with multiple anomalies such as microphakia and ectopiac lentis.
equine neonatal aniridia
believed to be inherited as an autosomal recessive trait in Belgian horses; sometimes occurs in association with cataracts.