I frequently get asked this question…
What has caused my pressure to read high?
Eye pressure is controlled by a watery fluid called aqueous humour which fills the front part of your eye. This fluid is formed just behind the iris (the coloured part of your eye) and flows through the pupil (the black central hole) and drains away through tiny drainage canals between the cornea and the iris.
In a ‘normal’ eye there is a balance between the production and drainage of this fluid, but in some eyes there is an imbalance. Most causes of raised pressure is due to the drainage of fluid becoming restricted, so the pressure inside the eye rises.