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Silicone tube shunt operations to drain the aqueous from the anterior chamber to the suprachoroidal space were performed in 12 different types of refractory glaucomas in which the intraocular pressure ranged from 25 mmHg to 80 mmHg (mean 45.75 mmHg) even after maximally tolerated medical treatment or after conventional glaucoma surgery. The post-silicone tube shunt intraocular pressure ranged from 7 mmHg to 34 mmHg (mean 15. 83 mmHg) after a follow-up period ranging 2 months in some cases to 24 months in others. The intraocular pressure was controlled in all cases postoperatively either with the operation alone or with medical treatment or after repeat operation. The complications were very few except in one case in which there was hyphema as well as vitreous hemorrhage prior to operation because of trauma for which pars plana vitrectomy followed by second silicone tube shunt operation were performed and at the end enucleation had to be done. Key Words: Artificial Drainage, Shunt Operation, Recalcitrant Glaucomas.