Necessity of an inferior peripheral iridectomy in Descemet membrane endothelial keratoplasty. a. Slit-lamp photograph showing reverse pupillary block from small air bubble, despite inferior peripheral iridectomy. Optical coherence tomography (OCT) horizontal line image shows nearly complete angle closure.b. Slit-lamp photograph showing patent inferior peripheral iridectomy with shallow anterior chamber present. OCT vertical line image showing preservation of open angle inferiorly by patent peripheral iridectomy. The patient’s intraocular pressure was 18£mm Hg at the time of these images (post-op day 1), and pupil block resolved with mydriasis.