This excerpt taken from the EYE 10-K filed Mar 1, 2007.
Glaucoma Implant. The Baerveldt glaucoma implant is indicated for use in patients with medically uncontrollable glaucoma and a poor surgical prognosis due to severe preexisting conditions. This can include: neovascular glaucoma, aphakic/pseudophakic glaucoma, failed conventional surgery, congenital glaucoma, and secondary glaucoma due to uveitis or epithelial down growth. Baerveldt glaucoma implants are available in three models, all of which feature a larger surface area plate than competing single-quadrant devices.