Common Eye Disorders Practice Test

Glaucoma drainage devices work by taking aqueous humor from the anterior chamber and routing it into a subconjunctival reservoir formed under the conjunctiva. The tube delivers fluid to a plate placed beneath the conjunctiva, and as the aqueous collects around that plate, a conjunctival bleb develops on the eye’s surface. This bleb is the functional drainage area where filtration occurs, helping to lower intraocular pressure. The vitreous cavity is not the typical destination for these devices, the anterior chamber is the source of the fluid, and while the plate is part of the hardware, the clinically relevant endpoint is the bleb that forms over it.