corneal arcus


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Related to corneal arcus: pterygium, xanthelasma, Corneal abrasion, Corneal ulcer, xanthomata

cor·ne·al ar·cus

(kōrnē-ăl ahrkŭs)
A thin, whitish circle around the iris; normal finding in old people.
Synonym(s): arcus senilis.

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
References in periodicals archive ?
Which of the following statements regarding] corneal arcus is TRUE?
Table 1 Classification of corneal degenerations Involutional Non-involutional Corneal arcus Band keratopathy Farinata Salzmann's nodular degeneration Furrow degeneration Spheroidal degeneration Crocodile Shagreen Terrien's marginal degeneration Table 2 Local and systemic causes of band keratopathy Local Systemic Chronic uveitis Hyperparathyroidism Intraocular silicone oil Renal failure Interstitial keratitis Excessive vitamin D intake Topical medications (phosphate containing) Sarcoidosis Juvenile dopathic arthritis Milk-alkali syndrome with uveitis Phthisis bulbi Hypophosphatasia