Glaucoma damage is irreversible and progressive.
Treating glaucoma is liking sailing a ship. Things move slowly but inexorable. The only way to steer the ship from sailing into the rocks ( blindness) is to lower the intra-ocular pressure to achieve a target pressure with various combinations of medications, laser or surgery.
To determine the target pressure required for the individual patient one needs to take compass bearing to see in which direction the ship is heading and how hard or lightly one needs to steer to preserve vision ..
To plot these compass bearings one needs various types of monitoring.
How is glaucoma detected?
Regular eye examinations by your ophthalmologist are the best way to detect glaucoma. A glaucoma screening that checks only the pressure of the eye is not sufficient to determine if you have glaucoma. The only sure way to detect glaucoma is to have a complete eye examination. During your glaucoma evaluation, your ophthalmologist will:
Measure your intraocular pressure
the drainage angle of your eye (gonioscopy)
Some of these tests may not be necessary for everyone. These tests may need to be repeated on a regular basis to monitor any changes in your condition.