*Maintains the intraocular pressure and inflates the globe of the eye. It is this hydrostatic pressure that keeps the eyeball in a roughly spherical shape and keeps the walls of the eyeball taut. *Provides nutrition (e.g. amino acids and glucose) for the avascular ocular tissues; posterior cornea, trabecular meshwork, lens, and anterior vitreous. *May serve to transport ascorbate in the anterior segment to act as an antioxidant agent. *Presence of immunoglobulins indicates a role in immune response to defend against pathogens. *Provides inflation for expansion of the cornea and thus increased protection against dust, wind, pollen grains, and some pathogens. *For refractive index. *Prevents eye dryness. Production<unk>  is secreted into the posterior chamber by the ciliary body, specifically the non-pigmented epithelium of the ciliary body (pars plicata). 5 alpha-dihydrocortisol, an enzyme inhibited by 5-alpha reductase inhibitors, may be involved in production of<unk> . Drainage<unk>  is continually produced by the ciliary processes and this rate of production must be balanced by an equal rate of<unk>  drainage. Small variations in the production or outflow of<unk>  will have a large influence on the intraocular pressure. The drainage route for<unk>  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<unk>  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<unk>  flow is provided by the trabecular meshwork (esp. the juxtacanalicular part), and this is where most of the<unk>  outflow occurs. The internal wall of the canal is very delicate and allows the fluid to filter due to the high pressure of the fluid within the eye. The secondary route is the uveoscleral drainage, and is independent of the intraocular pressure, the<unk>  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). 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, the hardness of the normal eye is compromised, leading to collapse and wilting of the cornea.
Aqueous humour
Blood blister
Speculum 
Fluid compartments
Dermal equivalent
Body fluid
Blood protein
Super-oxidized solution