arcus senilis
arcus senilis (är´k
s senil´is),
arcus senilis
[senē′lis]
Etymology: L, bow, aged
an opaque ring, gray to white in color, that surrounds the periphery of the cornea. It is caused by deposits of cholesterol in the cornea or hyaline degeneration and occurs primarily in older persons. See also gerontotoxon.
arcus senilis (är´k
s senil´is),n an opaque, grayish-white ring at the periphery of the cornea occurring in older adults.
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 arcus
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
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