Most headaches can be diagnosed by a medical history and physical exam. Rarely, to rule out other causes of headaches such as an aneurysm, tumor, or structural abnormality, a doctor may call for vision tests, X-rays, a CT scan, MRI, a lumbar puncture, or an EEG.
Medications can also prevent ocular migraines. Calcium-channel blockers, such as Cardene and Calan, are the most commonly used drugs. They work by opening up the blood vessels. Nonsteroidal anti-inflammatory drugs (NSAIDs) such as aspirin are also sometimes used. Less often, your doctor may prescribe drugs used to prevent blood clotting, depression, and epilepsy.
A device is also an option. Cefaly is the first FDA-approved device for preventing migraines in people over age 18. The portable headband-like device gives electrical impulses on the skin at the forehead. This stimulates a nerve associated with migraine headaches. Cefaly is used once a day for 20 minutes, and when it's on you'll feel a tingling or massaging sensation.