This is fluid similar to water but with nourishing salts sugar and protective vitamins. It is made by the epithelium of the ciliary body. It keeps the eye ball inflated in good shape.
It flows from the posterior chamber (behind the iris but in front of the vitreous), through the zonules and around the lens then through the pupil into the front (anterior) chamber where it bathes the iris and the inside of the cornea, before it drains out through the wall of the eye to the scleral veins. This drainage point is called the anterior chamber angle because the cornea and the iris meet at an angle. At this angle the aqueous passes through fine punctured plates.
If this angle area should be blocked by debris or iris then the outflow of fluid from the eye becomes blocked. Aqueous fluid eye pressure increases as aqueous is made but can't get out of the eye. This internal eye pressure can damage the optic nerve (glaucoma) or decrease blood flow into the eye.
This information site has been provided by varied UK and US eye doctors for patients with eye problems.
Once your eye doctor has made a diagnosis or recommended an investigation or treatment, then you will be able to find further explanation on this site.
It is not a self diagnosis centre. It should not be relied upon without taking professional advice.