Ezetimibe is a cholesterol medication that works by lowering the level of cholesterol in the blood. This helps reduce the risk of heart disease or other problems caused by high cholesterol. It is used with other cholesterol-lowering medicines (statins) and dietary changes to treat high cholesterol.

However, in some cases, it can be a symptom of a serious health problem. A doctor can diagnose it by conducting a visual exam. The ring can be white, gray, or blue and start at the top or bottom of the cornea. Sometimes it can extend to the iris and form a complete circle. If it does, it's usually a warning sign that you have heart disease.