The aqueous humour is a transparent water-like fluid similar to blood plasma, but containing low protein concentrations.

[7] 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.

If the fluid is leaking, the hardness of the normal eye is compromised, leading to collapse and wilting of the cornea.

[7] Glaucoma is a progressive optic neuropathy where retinal ganglion cells and their axons die causing a corresponding visual field defect.

However, increased interocular pressure is neither sufficient nor necessary for development of primary open angle glaucoma, although it is a major risk factor.