Note:  Do not rely on this information. It is very old.

Arcus Senilis

Arcus Senilis, the opaque zone which develops with advancing age at the outer part of the cornea. It appears earlier and becomes more marked in some persons than in others, and being due to a process of degeneration has been supposed to serve as an index of the degree of degenerative processes existing in other parts of the body. It is by no means to be relied on in, this particulair.