Utility of a Survey Instrument to Predict Benefit From a Novel Treatment for Vertical Heterophoria

Initially include all patients presenting to Emergency Department with chief complaints of Headache, Head Pain, Face Pain and/or Migraine. Inclusion Criteria: * Greater than or equal to 18 years old * Ability to speak and read English * Chronic headache disorder as defined by physician diagnosis, or greater than three months of headaches requiring symptom relief with medication more than once every two weeks, or having headaches so severe that previous Emergency Department evaluation or treatment was necessary Exclusion Criteria: * Symptoms directly caused by trauma within the last three months * Known TMJ disorder and presenting with TMJ pain * Suspected infectious sinusitis or meningitis * Pain originating from ear * Pain originating from dental source * Patient not willing or able to travel to study optometrist for follow-up * Known history of cerebral aneurysm * Known history of brain tumor * Without previous CT, MRI, or other imaging to assess patient's headache disorder * Patient a prisoner * Patient under temporary or permanent custodianship * Patient currently with questionable state of mental competence * Treating physician or study investigator believes patient to be inappropriate for study participation