There are multiple types of Laser Surgery for Glaucoma
Laser Iridotomy (iridectomy). This type of laser is used to make a hole in the iris. It is used to treat narrow angles and angle closure glaucoma. It can be performed with Yag laser or the argon laser.
Laser trabeculoplasty is used to lower the pressure in angles that are open. It can be performed with the argon laser (ALT), or the selective laser (SLT).
Laser cyclophotocoagulation is used to decrease the amount of fluid the eye makes to lower the pressure. It is performed by us with the diode laser.