6. Pigment Dispersion
This is a condition where the pigment of the eye goes places where it is not supposed to be. Normally the pigment of the eye stays put and makes up the colored part of the eye. This is what makes eyes appear to be blue, green, brown, and other colors.
The colored part of the eye is known as the iris. Normally, pigment granules stick very closely to the iris, but with this condition, they actually detach themselves from the iris and then move on to the rear surface of the cornea and various other structures in the back chamber of the eye.
But some of those granules may actually accumulate in the drainage of that chamber which means that the drainage is partially blocked. If the eye cannot drain properly, then pressure builds and results in intraocular pressure.