In a healthy eye, tears lubricate the outer surface of the eye and provide protection from the environment. With dry eye, the health and vision of the eye are affected due to poor quality or quantity of tears. Experts estimate that millions of adults in the United States are affected by dry eye. Patients suffering often complain of a scratchy sensation, stinging or burning, or the feeling that something is in the eye. Other symptoms include excess tearing, redness, discharge, pain or blurred vision. An examination of the eye is needed to help determine the cause and guide treatment.