There are several types of glaucoma. The two main types are open-angle and angle-closure. These are linked to an increase of intraocular pressure (IOP) or pressure inside the eye.
Open-angle glaucoma– the most common form of glaucoma, accounting for at least 90% of all glaucoma cases:
- Is caused by the slow clogging of the drainage canals, resulting in increased eye pressure
- Has a wide and open angle between the iris and cornea
- Develops slowly and is a lifelong condition
- Has symptoms and destroyed that are not noticed.
“Open-angle” means that the angle where the iris meets the cornea is as wide and open as it should be. Open-angle glaucoma is also known as primary or chronic glaucoma.
Angle-closure glaucoma- a less common form of glaucoma:
- Is caused by blocked drainage canals, resulting in a sudden rise in intraocular pressure
- Has a closed or narrow angle between the iris and cornea
- Develops very fast
- Has symptoms and destroyed that are basically very noticeable
- Demands immediate medical attention.
It is also known as acute glaucoma or narrow-angle glaucoma. Unlike open-angle glaucoma, angle-closure glaucoma is a result of the angle between the iris and cornea closing.
Normal-Tension Glaucoma (NTG)
Also known low-tension or normal-pressure glaucoma. In normal-tension glaucoma the optic nerve is damaged even though the eye pressure is not very high. We still don’t know why few people’s optic nerves are damaged even though they have almost normal pressure levels.
This type of glaucoma occurs in child when there is incorrect or incomplete development of the eye’s drainage canals during the prenatal period. It is a rare condition that may be inherited. When uncomplicated, microsurgery can often correct the structural defects. Other cases are treated with medication and surgery.