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Why do I have a white circle around the cornea?

Q: I am 40 years old. I have a white circle near the edge of my pupil for the past fifteen years. I don't have any problem due to this. But the size of the white circle appears to have grown. Will it have any adverse effects? Doctors say that it is due to accumulation of cholesterol. Is it true? I have astigmatism with myopia. Please advise.

A:The white circle that you have described must be at the outer margin of your cornea and not your pupil. This is common in elderly people and is known as arcus senilis. When it occurs in young people like you, it is known as arcus juvenilis. There is a possibility of a link between increased cholesterol levels in the blood and the arcus. This is not going to cause any harm except for cosmetic appearance.

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