How does a drainage device for Glaucoma work?

Some people with advanced glaucoma may be eligible for drainage implants to help reduce the eye's intraocular pressure. This drainage device redirects the outflow of fluid through a small tube into an outlet chamber or tiny pocket where the fluid is then reabsorbed by the body. This lowers pressure inside of the eye, which can prevent further damage to the optic nerve. During the weeks following surgery, eye drops must be used to prevent inflammation and infection. Frequent follow-up visits may be necessary to determine if any further treatment is required.