Chronic Open Angle Glaucoma, the ‘sneak thief of sight’, usually has no symptoms. You lose vision from the outside as a result of slowly increasing pressure in the eye. Eye specialists usually treat this with drops.
Acute Closed angle glaucoma is a painful, sudden loss of vision in an eye. This usually gets better, but attacks become more frequent over time. This is usually cured with a laser.
Low Tension Glaucoma is similar in effect to Chronic Open Angle Glaucoma, but the pressure is normal.
Glaucoma is detected by your optometrist with a close look at the optic nerve, as well as measurement of your eye pressure. More sophisticated tests can involve testing of the visual field and nerve fibre measurements.