<P> The drainage route for aqueous humour flow is first through the posterior chamber, then the narrow space between the posterior iris and the anterior lens (contributes to small resistance), through the pupil to enter the anterior chamber . From there, the aqueous humour exits the eye through the trabecular meshwork into Schlemm's canal (a channel at the limbus, i.e., the joining point of the cornea and sclera, which encircles the cornea) It flows through 25--30 collector canals into the episcleral veins . The greatest resistance to aqueous flow is provided by the trabecular meshwork (esp . the juxtacanalicular part), and this is where most of the aqueous outflow occurs . The internal wall of the canal is very delicate and allows the fluid to filter due to high pressure of the fluid within the eye . The secondary route is the uveoscleral drainage, and is independent of the intraocular pressure, the aqueous flows through here, but to a lesser extent than through the trabecular meshwork (approx. 10% of the total drainage whereas by trabecular meshwork 90% of the total drainage). </P> <P> The fluid is normally 15 mmHg (0.6 inHg) above atmospheric pressure, so when a syringe is injected the fluid flows easily . If the fluid is leaking, due to collapse and wilting of cornea, the hardness of the normal eye is therefore corroborated . </P> <P> Glaucoma is a progressive optic neuropathy where retinal ganglion cells and their axons die causing a corresponding visual field defect . An important risk factor is increased intraocular pressure (pressure within the eye) either through increased production or decreased outflow of aqueous humour . Increased resistance to outflow of aqueous humour may occur due to an abnormal trabecular mesh work or to obliteration of the meshwork due to injury or disease of the iris . However, increased interocular pressure is neither sufficient nor necessary for development of primary open angle glaucoma, although it is a major risk factor . Uncontrolled glaucoma typically leads to visual field loss and ultimately blindness . </P> <Ul> <Li> <P> Structures of the eye labeled </P> </Li> <Li> <P> This image shows another labeled view of the structures of the eye </P> </Li> </Ul>

Which of the following would be the structure in the eye that would drain the aqueous humor