Understanding Angle Closure and Open Angle Glaucoma

by Sep 12, 2023

Glaucoma is a chronic eye condition that can lead to vision loss and, if left untreated, even blindness. It is crucial to understand the different types of glaucoma to ensure timely diagnosis and appropriate treatment. This article aims to shed light on the contrast between angle closure glaucoma and open-angle glaucoma, the two main classifications of this condition.


Open Angle Glaucoma: A Silent Progression

The majority of glaucoma cases fall under the category of open-angle glaucoma. This type of glaucoma is insidious, often developing slowly over time. Unfortunately, it doesn’t present many noticeable symptoms in its early stages, which can make it challenging to detect without regular eye exams.

Despite its asymptomatic nature, open-angle glaucoma gradually damages the optic nerve, which is responsible for transmitting visual information to the brain. This damage often occurs due to inadequate drainage of the fluid (aqueous humor) within the eye, leading to increased intraocular pressure.

As the condition progresses, individuals with open-angle glaucoma may begin to experience peripheral vision loss, commonly referred to as tunnel vision. This visual impairment can impair daily activities and significantly impact a person’s quality of life. Therefore, routine eye examinations are essential for early detection, enabling the timely intervention that can preserve sight.


Angle-Closure Glaucoma: An Acute Episode

In contrast to the slow progression of open-angle glaucoma, angle-closure glaucoma is characterized by sudden and severe symptoms. This type of glaucoma occurs when the drainage angle, located between the iris and the cornea, becomes narrow or completely closed off. As a result, the aqueous humor cannot flow out of the eye as efficiently, resulting in a rapid increase in intraocular pressure.

The symptoms of angle closure glaucoma are hard to miss. An affected individual may experience a painful episode with a red eye, accompanied by nausea or vomiting. Additionally, immediate blurred vision can occur, emphasizing the urgency of seeking medical attention.

Unlike the gradual damage associated with open-angle glaucoma, angle closure glaucoma demands immediate intervention to relieve the elevated intraocular pressure and prevent irreversible vision loss. Prompt treatment may involve medications to lower eye pressure or laser surgery to create a pathway for fluid drainage.


Understanding the Mechanisms

The key distinction between angle closure glaucoma and open-angle glaucoma lies in the underlying mechanisms that cause them.

Open Angle Glaucoma: In this form of glaucoma, the drainage angle remains open; however, there is a decreased ability for fluid to efficiently exit the eye. The gradual blockage of the drainage channels leads to an increase in intraocular pressure, resulting in optic nerve damage over time. Regular eye examinations with intraocular pressure measurements are crucial for early detection.

Angle Closure Glaucoma: Angle-closure glaucoma occurs when the anterior chamber angle narrows or closes off completely, preventing the aqueous humor from flowing out of the eye adequately. This closure causes a rapid and significant increase in intraocular pressure. The sudden onset of symptoms necessitates immediate medical attention to alleviate the pressure and prevent irreversible vision loss.


Seeking Proper Diagnosis and Treatment

The nature of glaucoma, whether angle closure or open-angle glaucoma, highlights the importance of regular eye examinations as a fundamental aspect of preventive eye care. These comprehensive exams, including measurements of intraocular pressure and thorough evaluations of the optic nerve, help detect and monitor the onset and progression of glaucoma.

If you experience symptoms such as sudden eye pain, redness, or blurred vision, it is vital to seek immediate medical attention. An eye healthcare professional will conduct a thorough examination, which may include measuring intraocular pressure, assessing the angle structure, and evaluating the optic nerve.

Based on the diagnosis, appropriate treatment options will be recommended. These may include medicated eye drops, oral medications, laser surgery, or, in some cases, traditional surgery to help manage intraocular pressure and preserve vision.



Our eye doctors at EyeDocs Family Eye Care in Brookville, OH excel in the prescription of glasses, contact lenses and the diagnosis of a variety of eye diseases. Call our optometrists at 937-770-1265 or schedule an eye exam appointment online if you would like to learn more about open-angle and angle closure glaucoma. Our eye doctors, Dr. Kyle Maxam and Dr. Cara Wampler provide the highest quality optometry services and eye exams in Brookville, Ohio.

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