YAG Peripheral Iridotomy
About YAG Peripheral Iridotomy
Pupillary block glaucoma and angle-closure glaucoma are medical emergencies. Pupillary block is when a relative seal forms between the pupillary portion of the iris and the lens. Angle-closure is when the iris blocks the drainage angle of the eye. Both result in poor drainage of aqueous fluid out of the eye leading to increased intraocular pressure, or IOP. Medical and surgical intervention is immediately needed in order to prevent permanent damage to the vision. Once the eye is stabilized and the cornea is clear, a YAG laser peripheral iridotomy (Yag PI or LPI) should be performed. This creates a tiny opening in the iris, which acts as a pressure relief valve. The flow of fluid through this opening resolves the pupillary block or angle closure and protects your vision from further damage.