arcus senilis

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arcus

 [ahr´kus] (pl. ar´cus) (L.)
arch; bow.
arcus adipo´sus arcus corneae.
arcus cor´neae (arcus cornea´lis) a white or gray opaque ring in the corneal margin; it may be present at birth or appear in childhood (see arcus juvenilis), but the condition is particularly common in those over 50 years old (see arcus senilis). It results from cholesterol deposits in or hyaline degeneration of the corneal stroma and may be associated with ocular defects or with familial hyperlipidemia.
arcus juveni´lis arcus corneae in young persons.
arcus seni´lis arcus corneae in the elderly. (See Atlas 4, Part E).
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ar·cus se·ni·'lis

an opaque, grayish ring at the periphery of the cornea just within the sclerocorneal junction, of frequent occurrence in the aged; it results from a deposit of fatty granules in, or hyaline degeneration of, the lamellae and cells of the cornea.
Farlex Partner Medical Dictionary © Farlex 2012

arcus senilis

Geriatrics A cloudy, opaque ring around the cornea and iris which, in those younger than 50, often indicates hypercholesterolemia, but in the elderly has no significance
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

ar·cus se·ni·lis

(ahr'kŭs sĕ-nī'lis)
An opaque, grayish ring at the periphery of the cornea just within the sclerocorneal junction; frequent occurrence in old people; it results from a deposit of fatty granules in, or hyaline degeneration of, the lamellae and cells of the cornea.
Synonym(s): anterior embryotoxon, arcus cornealis, gerontoxon.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
Enlarge picture
ARCUS SENILIS

arcus senilis

An opaque white ring about the periphery of the cornea, seen in the aged. It is caused by the deposit of fat granules in the cornea or by hyaline degeneration.
See: illustration
See also: arcus
Medical Dictionary, © 2009 Farlex and Partners

arcus senilis

A white ring near the outer margin of the CORNEA. This is a normal feature of age and is of no significance. Vision is never affected.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

corneal arcus 

A greyish-white ring (or part of a ring) opacity occurring in the periphery of the cornea, in middle and old age. It is due to a lipid infiltration of the corneal stroma. With age the condition progresses to form a complete ring. That ring is separated from the limbus by a zone of clear cornea. The condition can also appear in early or middle life and is referred to as arcus juvenilis (or anterior embryotoxon); it is somewhat whiter than corneal arcus. Arcus juvenilis is often associated with heart disease in men (Fig. C19). Syn. arcus senilis; gerontoxon. See marginal furrow.
Fig. C19 Advanced corneal arcusenlarge picture
Fig. C19 Advanced corneal arcus
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

ar·cus se·ni·lis

(ahr'kŭs sĕ-nil'is)
An opaque, grayish ring at the periphery of the cornea just within the sclerocorneal junction; frequent occurrence in old people.
Synonym(s): anterior embryotoxon, gerontoxon.
Medical Dictionary for the Dental Professions © Farlex 2012