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Arcus senilis : ウィキペディア英語版
Arcus senilis

Arcus senilis (or ''arcus senilis corneae'') is a white, grey, or blue opaque ring in the corneal margin (peripheral corneal opacity), or white ring in front of the periphery of the iris. It is present at birth, but then fades; however, it is quite commonly present in the elderly. It can also appear earlier in life as a result of hypercholesterolemia. Arcus senilis can be confused with the limbus sign, which reflects calcium rather than lipid deposits.
==Alternative names==

It is also called ''arcus adiposus'', ''arcus juvenilis'' (when it occurs in younger individuals), ''arcus lipoides corneae'' or ''arcus cornealis''; sometimes a ''gerontoxon''.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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