This is a grayish-white ring-shaped fatty deposit near the limbus that can occur at any age but usually appears in advanced age (Fig. 5.14). Arcus senilis is usually bilateral and is a frequently encountered phenomenon. It occurs as a result of lipid deposits from the vessels of the limbus along the entire periphery of the cornea, which normally increase with advanced age. A lipid-free clear zone along the limbus will be discernible. Patients younger than 50 years who develop arcus senilis should be examined to exclude hypercholesteremia as a cause. Arcus senilis requires no treatment as it does not cause any visual impairments.
The deposits and pigmentations discussed in the following section do not generally impair vision.
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