Ahmed valve for neovascular glaucoma

Placement of an Ahmed valve with the drainage tube in the anterior chamber in an eye with unconrolled neovascular glaucoma. This 81 year old man has been managed for 3 months with laser, drops and oral medications for neovascular glaucoma induced by a central retinal vein occlusion. His intraocular pressure is between 30 and 40 despite maximal medical therapy. He also has a history of heart failure. Some of his glaucoma medications cannot be continued without risk of exacerbating his heart disease. His visual acuity is 20/160 in this eye. His other eye is 20/60 because of a macular pucker.