What is the most common form of glaucoma?

Open-angled glaucoma is recognized as the most common form of glaucoma, accounting for the majority of cases. This type is characterized by a gradual increase in intraocular pressure that can damage the optic nerve over time. One of the defining features of open-angled glaucoma is that it typically progresses without noticeable symptoms in the early stages, which can lead to significant vision loss if not detected and treated. The drainage angle of the eye remains open, but the trabecular meshwork is not functioning effectively, leading to an increase in eye pressure.

In contrast, closed-angled glaucoma, while serious, occurs less frequently and is characterized by a sudden increase in intraocular pressure, often accompanied by acute symptoms like severe eye pain and nausea. Normal tension glaucoma presents a unique challenge because it occurs even when eye pressure is within the normal range, making it less common and often harder to diagnose than open-angled glaucoma. Secondary glaucoma arises due to other medical conditions or factors, such as inflammation or trauma, and is not classified as a primary form of glaucoma, making it less common than open-angled glaucoma.

Therefore, the prevalence and typical presentation of open-angled glaucoma are what make it the most common form of the condition.