The goal of this observational study is to evaluate the long-term safety and efficacy of a modified suprachoroidal silicone tube (SST) shunt in treating patients with primary open-angle glaucoma (POAG) and pseudo-exfoliative glaucoma (PXG). The main questions it aims to answer are: Does the SST shunt maintain intraocular pressure (IOP) reduction over an extended follow-up period? What is the effect of the SST shunt on endothelial cell count (ECC) and overall corneal health? Participants will: Undergo intraocular pressure (IOP) measurements Have their endothelial cell count (ECC) evaluated Complete assessments of best corrected visual acuity (BCVA) Be assessed for C/D ratio Be monitored for adverse events or shunt-related complications over time