- chronic open-angle glaucoma – this is the most common type of glaucoma and develops very slowly. It is often painless with no obvious symptoms until the condition is fairly advanced.
- primary angle-closure glaucoma – this is rare and can occur slowly (chronic) or may develop rapidly (acute) with a sudden, painful build-up of pressure in the eye
- secondary glaucoma – this occurs as a result of an eye injury or another eye condition, such as uveitis (inflammation of the middle layer of the eye)
- developmental glaucoma (congenital glaucoma) – this is rare but can be serious. It is usually present at birth or develops shortly after birth. It is caused by an abnormality of the eye
Glaucoma is a term that describes a group of eye conditions that affect vision where raised pressure in your eye causes damage to the the optic nerve (which connects the eye to the brain) and the nerve fibres from the retina (the light-sensitive nerve tissue that lines the back of the eye). Glaucoma often affects both eyes, usually in varying degrees. There are four main types of glaucoma: