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

A Vertical Heterophoria Symptom Questionnaire (VHSQ) as well as Headache Disability Index (HDI) survey is used on all Emergency Department (ED) headache patients to assess medical history and symptom burden. Prism testing (or Prism Challenge) is performed by the study optometrist to identify those who have Vertical Heterophoria (VH). Prism Challenge is similar to prescription eyeglass testing, but with unique lenses that are meant to reduce strain on eyes that are misaligned. Follow-up questionnaires are then administered to assess any improvement in symptom burden.