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In elderly persons we ought always to look for the arcus senilis, which is a sign of a tendency to fatty degeneration.

Moreover, there is the arcus senilis, the fine translucent to opaque circle surrounding the outer portion of the iris.

A common sign of aging, though not of illness, is the arcus senilis, a whitish or grayish ring that forms around the iris in many older people.

This must be distinguished from the true fatty arcus senilis.

Practically every one with a well-marked arcus senilis has arteriosclerosis, but vice versa not every one with even marked arteriosclerosis has an arcus senilis.