There are many types of glaucoma but the major one is open-angle glaucoma and angle-closure glaucoma. Glaucoma intraocular pressure (IOP) is a cause of these types. This includes:
Open-angle glaucoma is the most common form which comprises about at least 90% of all glaucoma cases. Open-angle defines the angle where iris meets the cornea and this point is as wide and open as it should be. This is also known as primary, chronic or wide-angle glaucoma.
The open-angle glaucoma is caused by:
- The slow clogging of the drainage canals which increase the eye pressure
- The area where iris connects with the cornea is wide and open.
- It develops slowly and is a lifelong condition.
- By damaging the area where cornea and iris connect. It is not noticeable.
- Has no symptoms
It is the less common form of glaucoma. It affects the people when the angle between the iris and cornea is closed. This type is stimulated by the sudden blockage of aqueous humour fluid that eventually builds up in the area. In this way, the severe or quick rise of intraocular pressure (IOP). The apparent symptoms are pain, blurred vision or nausea.
This type requires immediate medical care if it becomes severe. Also known as acute glaucoma or narrow-angle glaucoma.
Normal-Tension Glaucoma (NTG)
The optic nerves of the eye are damaged but the pressure is normal. This is also called low-tension or normal-pressure glaucoma. Researchers are still investigating the prime cause of glaucoma. Mainly, it is linked with other eye diseases.
In this type, the babies are born with some defect in the angle of their eyes that slows the normal fluid drainage. Congenital glaucoma has some symptoms such as cloudy eyes, excessive tearing, or sensitivity to light. People can inherit from their families.
Secondary glaucoma correlates with the injury or another eye condition, such as cataracts or eye tumours. Also, medication such as corticosteroids may be one of the causes of glaucoma. Less commonly, eye surgery also results in secondary glaucoma. Overall, it is the effect of multiple conditions.
There are several other types of glaucoma that include:
- Pigmentary Glaucoma
- Pseudoexfoliative Glaucoma
- Traumatic Glaucoma
- Neovascular Glaucoma
- Uveitic Glaucoma