There are 4 types of Glaucoma
Closed Angle Glaucoma — The eye’s drainage system physically closes up leading to high pressure; this can happen suddenly (acute) or slowly (chronic)
Low Pressure Glaucoma — The optic nerve is weak and becomes damaged even with normal pressure
Open Angle Glaucoma — The eye’s drainage system slowly becomes defective, leading to high pressure
Secondary Glaucoma — Other eye conditions or certain drugs cause the pressure in the eye to rise