SOLX Gold Shunt for Refractory Glaucoma

Inclusion Criteria: * primary open-angle glaucoma * age 21 or over * refractory glaucoma, with IOP ≥ 24 mmHg on medications and failed prior incisional glaucoma surgery * detectable visual field defect (negative MD score) * written informed consent * available for up to 24 months follow-up Exclusion Criteria: * either eye with VA worse than count fingers * angle closure glaucoma episode within past 12 months * uveitic glaucoma, iridocorneal endothelial (ICE) syndrome, traumatic glaucoma, or neovascular glaucoma * diagnosis of pigmentary glaucoma or pseudoexfoliative glaucoma * other significant ocular disease, except cataract * active ocular infection * expected ocular surgery in next 12 months * no suitable quadrant for implant * systemic corticosteroid therapy \> 5 mg/day prednisone * intolerance to gonioscopy or other eye exams * mental impairment interfering with consent or compliance * pregnancy * known sensitivity to anticipated medications used at surgery * significant co-morbid disease * concurrent enrollment in another drug or device study