Anterior segment imaging in angle-closure disease

Introduction Angle-closure disease (both primary and secondary) is a spectrum of disorders characterized by iridotrabecular contact obstructing aqueous outflow. Anterior segment imaging plays an important role in understanding the pathophysiology of angle closure, diagnosis, and monitoring the treatment, especially in challenging cases. Indirect gonioscopy, the gold standard for visualizing the anterior chamber angle (ACA) is a subjective technique with moderate agreement among experts and inability to visualize structures posterior to the iris. It is affected by room illumination, pressure on the globe, clinicians’ skill, and patient cooperation. With advances in technology, many instruments are available for imaging the anterior segment. Each comes with its own advantages and limitations which the clinician must consider while making decisions.