There are no known illnesses specifically related to having a limbal ring.  However, in some cases, changes to the appearance of the limbal ring or other parts of the eye could be a sign of an underlying health condition or disease.  For example, a change in the color or clarity of the cornea, which surrounds the iris and is adjacent to the limbal ring, could indicate a problem like an infection, inflammation, or injury--just keep an eye on it.  Seriously though, if you notice any sudden changes or other unusual features in your eye, it is always a good idea to consult with an eye doctor or healthcare professional for a proper diagnosis and treatment.
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