Study Design Prospective, interventional case series Patients with an occludable angle in more than two quadrants in dark room dynamic gonioscopy and patent iridotomies of at least 2 weeks were included. A supplemental diagnosis regarding the etiology of persistent angle closure by ultrabiomicroscopy and A-scan ultrasound will be obtained. Patients who presented with these criteria to the angle closure clinic at the glaucoma service of our institute (Instituto de Oftalmologia Fundacion Conde de Valenciana IAP, Mexico City) between July and November 2012 were included.