Shingles is caused by the herpes zoster virus, the same virus that causes chicken pox. Aging, compromised immunity or other illness can cause the virus to awaken from dormancy. Shingles usually affects the torso, causing a painful rash with blisters. When shingles affects the eye, it is known as herpes zoster opthalmicus. Treatment includes oral antiviral medications and oral corticosteroids. It's important to seek treatment right away to prevent complications, including severe, recurring pain or relapses of the disease.