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What is Arcus senilis and explain in detail?
Arcus senilis (AS), also known as gerontoxon, arcus lipoides, arcus cornae, corneal arcus, arcus adiposus, or arcus cornealis, are rings in the peripheral cornea. It‘s usually caused by cholesterol deposits, so it may be a sign of high cholesterol. It is the most common peripheral corneal opacity, and is usually found in the elderly where it is considered a benign condition. When AS is found in patients less than 50 years old it is termed arcus juvenilis. The finding of arcus juvenilis in combination with hyperlipidemia in younger men represents an increased risk for cardiovascular disease.

Pathophysiology
AS is caused by leakage of lipoproteins from limbal capillaries into the corneal stroma