coloboma (redirected from typical coloboma)

coloboma /col·o·bo·ma/ (kol?o-bo´mah) pl. colobomas, colobo´mata   [L.]

1. an absence or defect of tissue.

2. a defect of ocular tissue, due to failure of part of the fetal fissure to close; it may affect the choroid, ciliary body, eyelid, iris, lens, optic nerve, or retina.

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bridge coloboma  coloboma of the iris in which a strip of iris tissue bridges over the fissure.

Fuchs' coloboma  a small, crescent-shaped defect of the choroid at the lower edge of the optic disk.

coloboma lo´buli  fissure of the ear lobe.

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col·o·bo·ma (kl-bm)

n. pl. col·o·bo·mas or col·o·bo·ma·ta (-m-t)

An anomaly of the eye, usually a developmental defect, often resulting in some vision loss.

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coloboma

an apparent absence or defect of some ocular tissue, usually due to failure of a part of the fetal fissure to close; it may affect the choroid, ciliary body, eyelid (palpebral coloboma, coloboma palpebrale), iris (coloboma iridis), lens (coloboma lentis), optic nerve or retina (coloboma retinae). Colobomas of the choroid are common in cattle, and have been observed in miniature swine. Colobomas of the optic disk are an inherited defect in several breeds of cattle.

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atypical coloboma

on occurring at a location other than the fetal fissure.

iris coloboma

a full thickness defect in the iris. When it occurs at the base of the iris, it is called iridodiastasis.

optic nerve coloboma

part of the scleral ectasia syndrome in dogs; also seen in Basenji dogs and Charolais cattle.

typical coloboma

one occurring in or near to the fetal cleft.