Close. Search Kayser-Fleischer ring on wikipedia; shows photo of ring around the IRIS.
Wilson's disease is a disorder of copper metabolism, with a ring around the cornea (the front clear part of the eye) called a Kayser-Fleischer ring. If you are concerned, see an ophthalmologist for a full exam, since the disease can cause liver or neurologic damage.
I forgot to mention it's a ring around the pupil