Glaucoma implants, also known as glaucoma drainage devices, are used to delay or even stop the progression of glaucoma. This effort is made so that the patient's condition does not lead to blindness. Glaucoma implants work by removing fluid from the eyeball. Thus, the pressure on the eyeball can be reduced. The cause of glaucoma itself is increased pressure in the eyeball. Eyeball pressure (or also called intraocular pressure) increases due to a buildup of fluid in the eye. This accumulation of tear fluid then presses on the nerves until it finally causes damage to the visual nerves.