DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Arcus senilis. Close-up of the eye of an 82 year- old woman, showing arcus senilis. This condition, which doesn't affect vision, manifests itself as a greyish line in the periphery of the cornea that appears around the edge of the iris. Arcus senilis consists of an infiltration of fatty material and is common in the elderly. When it occurs in younger people it may indicate abnormal fat metabolism. There is a wide racial variation in its incidence.
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