- coloboma of optic disk
- coloboma of optic nerve 1. a coloboma, mild or severe, within or at the optic nerve head. A mild coloboma may be a separate, isolated entity, unilateral, and limited to minor cupping in the optic disk. A severe coloboma may be part of a bridge coloboma or part of a complete coloboma, or it may enlarge the optic disk two to four times and thus affect the adjacent retina and choroid. Nystagmus, strabismus, severe impairment of vision, microphthalmia, cyclopia, and anencephaly may be present. 2. a defect attributed to the incomplete closure of the fetal fissure of the optic stalk.
Medical dictionary. 2011.
Look at other dictionaries:
Coloboma of optic nerve — Morning Glory syndrome Classification and external resources OMIM 120430 Coloboma of optic nerve or Morning Glory syndrome is a rare defect of the optic nerve that causes moderate to severe blindness. It is extremely rare, occurring in only one… … Wikipedia
coloboma at optic nerve entrance — a coloboma of the optic disk that affects only the optic nerve … Medical dictionary
Coloboma — A congenital malformation (birth defect) in which part of the eye does not form due to failure of fusion of an embryonic feature called the intraocular fissure. The resultant coloboma can be likened to a missing slice from a pie that may involve… … Medical dictionary
complete coloboma — a typical coloboma when it extends from the pupillary margin to the posterior pole, therefore involving the iris, ciliary body, choroid, retina, and optic disk … Medical dictionary
Fuchs coloboma — a small conus or crescent on the choroid, at the lower edge of the optic disk … Medical dictionary
peripapillary coloboma — a chorioretinal defect surrounding or extending down from the optic disk … Medical dictionary
retinochoroidal coloboma — an absence of retinal and choroidal tissue, usually in the lower fundus, marked by a bright white ectatic zone of exposed sclera extending into and distorting the optic disk. Called also c. of fundus … Medical dictionary
Amaurosis fugax — Infobox Disease Name = Amaurosis fugax Caption = The arteries of the choroid and iris. The greater part of the sclera has been removed. DiseasesDB = 501 ICD10 = ICD10|G|45|3|g|40 ICD9 = ICD9|362.34 ICDO = OMIM = MedlinePlus = 000784 eMedicineSubj … Wikipedia
conus — 1. [TA] SYN: cone. 2. Posterior staphyloma in myopic choroidopathy. [L. fr. G. konos, cone] c. arteriosus [TA] the left or anterosuperior, smooth walled portion of the cavity of the right ventricle of the … Medical dictionary
syndrome — The aggregate of symptoms and signs associated with any morbid process, and constituting together the picture of the disease. SEE ALSO: disease. [G. s., a running together, tumultuous concourse; (in med.) a concurrence of symptoms, fr. syn,… … Medical dictionary