1. Open-angle glaucoma
It is of unknown cause. The structures of the corner of the eye through which the aqueous humor passes seem normal, but despite this the flow of the aqueous humor is slowed down, it stays in the eye longer than it should, leading to an increase in intraocular pressure. If left untreated, it presses on and damages the optic nerve.
2. Closed-angle glaucoma
The cause lies in the anatomical structure of the corner of the eye, which is narrow or completely closed, which makes it much more difficult for the eye water to flow out and damages the optic nerve.
3. Infantile (childhood) glaucoma
It can occur at birth (congenital glaucoma) and between the ages of three and sixteen (juvenile glaucoma). It often has a worse prognosis than glaucoma, which occurs in adults.
4. Secondary glaucoma
It can occur after eye surgery, eye injuries, recurrent complicated eye infections, long-term use of corticosteroids, systemic diseases such as diabetes or cataracts.