IOP (intraocular pressure)
The pressure created by the continual renewal of fluids within the eye.
The normal IOP varies among individuals.
The intraocular pressure is increased in glaucoma.</P> In acute angle-closure glaucoma, the intraocular pressure rises because the canal which normally drains the fluid in the front part of the eye is suddenly blocked.</P> In chronic glaucoma, there is a gradual imbalance between the production and removal (resorption) of the fluid in the back part of the eye (with supply exceeding demand).