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Hello and thanks for your question. The white circle is deposition of cholesterol and lipids in the outer portion of the cornea. This is a very common sign seen in people as they age. It is usually nothing to worry about unless there is no sign of it on the other eye. If that is the case, then it may be the eye without this white ring may have poor blood flow to that eye.
But otherwise, it is usually nothing to worry about as far as the eyes are concerned, but it does suggest a possible increased cholesterol in the blood so if you don't have a medical history of high cholesterol, this is something you should get checked out.
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.