Surgical Treatment of Refractory Open Angle Glaucoma

Inclusion Criteria: * Available for up to 3 years follow-up. * Diagnosed with primary open-angle, pseudoexfoliative, or pigmentary glaucoma or more than one glaucoma diagnosis of these types. * Subject scheduled to undergo glaucoma surgery with the Suprachoroidal Dissection Instrument involving creation of fistula between Schlemm's canal and the suprachoroidal space without combined cataract surgery. * Subject has failed at least one incisional glaucoma surgery (trabeculectomy, tube shunt, deep sclerectomy, viscocanalostomy, canaloplasty) or angle surgery (Trabectome) OR Is not a candidate for conventional glaucoma surgery due to reasons such as the presence of scleral buckle or compromised conjunctiva. * Subject has IOP ≥ 16 mm Hg on maximally tolerated medications within the six week (-42 days) period prior to surgery. * Visual field defect defined as mean deviation (MD) score worse than or equal to -10 dB on the Swedish Interactive Threshold Algorithm \[SITA\] Standard 24-2 Humphrey Analysis during the 6 month period prior to surgery. OR Subject has vertical cup-to-disk ratio ≥ 0.75 during the 6 month period prior to surgery. Exclusion Criteria: * Significant lens opacities or patient is candidate for cataract surgery during the duration of the study. * The patient had developmental glaucoma or a secondary glaucoma including steroid-induced, uveitic, or neovascular glaucoma (with the exception of pigmentary and pseudoexfoliative glaucoma). * The patient has narrow angle component possibly associated with glaucoma in the operative eye. * The subject has angle recession in the operative eye. * Significant ocular disease other than glaucoma affecting the assessment of visual function.