A dark or white circular segment over your cornea is known as arcus senilis. Furthermore, on the off chance that you have one, it could be an indication that you need to scale back fatty foods. Arcus senilis is generally regular in grown-ups, and an aftereffect of greasy stores around the edge of the cornea. In more serious cases, particularly when it happens in more youthful individuals, it very well may be the aftereffect of elevated cholesterol or high fatty substance level.