Glaucoma surgery is used to reduce intraocular pressure and it is divided into:

1. Invasive surgical procedures such as Ahmad valve and trabeculectomy. 

2. Minimally invasive surgical procedures such as ECP (endocyclophotocoagulation).

3. Nonsurgical procedures such as: MLT (micopulse laser trabeculoplasty), G6 micropulse, and UCP (ultrasonic ciliary plasty)