[YAG laser iris hole at 6 o'clock in the periphery in the treatment or prevention of closed angle glaucoma and plateau iris and in pupillary block (posterior iris surface-blocking mechanism)].

A shunt between the anterior and the posterior chamber, achieved by shooting an iris hole with a YAG Laser, is presumed to prevent angle closure in eyes with narrow angle glaucoma. Because of their thickening effect on all types of eye tissue, it is advisable to reduce pilocarpine and other miotics once the peripheral iris hole has been created. This is best made at 6 o'clock, since any hemorrhaging caused beneath this point will cease of its own accord. The shunt brings about deepening of the peripheral chamber, and almost always widens the angle in narrow angle glaucoma.