Questionnaire for the assessment of adherence barriers of intravitreal therapy: the ABQ‑IVT

The previously validated (indications: atrial fibrillation, human immunodeficiency virus, chronic inflammatory lung disease) Adherence Barriers Questionnaire (ABQ) was revised according to specifications of IVT, within the framework of an expert panel. A cross-sectional patient survey was conducted in combination with a retrospective medical chart review in order to validate the developed new instrument (ABQ-IVT).