Laser peripheral iridotomy (also described as ‘laser iridotomy’ or simply termed 'iridotomy') is a medical procedure which uses a laser device to create a hole in the iris, thereby allowing aqueous humor to traverse directly from the posterior to the anterior chamber and, consequently, relieve a pupillary block. Credits: Professor Ana IM Miguel, Polyclinique de la Baie, France. Slit lamp photo of a superior iridotomy at 10 o'clock. Iridotomy closure and necessity for repeat LPI 5.1 Argon/Nd:YAG-KTP 532 nm or solid-state Laser.Systemic drugs with effects on the iridocorneal angle Congenital anomalies that can be associated with secondary glaucoma Aqueous Misdirection, Cilio-lenticular block, Ciliary Block or Malignant Glaucoma Plateau Iris Configuration and Plateau Iris Syndrome Pigmentary Dispersion Syndrome (PDS), Pigmentary Ocular Hypertension (POH) and Pigmentary Glaucoma (PG) Primary Angle Closure (PAC) and Primary Angle-Closure Glaucoma (PACG) Primary-Angle Closure suspect (PACS), “narrow” or “occludable” angle Contralateral Eye in Acute Primary Angle Closure