Introduction
Glaucoma is a permanent optic neuropathy with characteristic optic disc changes and corresponding visual field abnormalities, where intraocular pressure (IOP) is a major modifiable risk factor.1 It is the leading cause of irreversible blindness worldwide2 and can be categorized into open vs closed angle or primary vs secondary. Treatment usually starts with medical therapy to lower IOP, followed by surgery (trabeculectomy or filtering shunt). Laser peripheral iridotomy (LPI) is also used in the treatment of primary angle closure glaucoma (PACG). Indications for surgery include failure of medical treatment and LPI, side effects of treatment such as severe ocular surface disease, or noncompliance with medical treatment.1
Minimally invasive glaucoma surgery (MIGS) is a group of techniques which aims to…