Final answer:
Arcus senilis is a white/grey/blue opaque ring that appears around the periphery of the cornea in elderly individuals.
Step-by-step explanation:
Arcus senilis is a white/grey/blue opaque ring that appears around the periphery of the cornea. It is a common condition seen in elderly individuals. This ring is caused by the deposition of lipids in the cornea and typically does not affect vision or cause any symptoms.