Narrow angle glaucoma, also known as closed-angle or angle-closure glaucoma, is less common than open angle glaucoma. This type of glaucoma can be chronic and progress over time, or it can be acute – appearing suddenly. In the acute form, it is a medical emergency that requires immediate attention. This condition can lead to blindness within 3-5 days.
Narrow angle glaucoma occurs as a result of a rapid increase in intraocular pressure. It occurs when the drainage angle between the iris and cornea decreases, thus preventing the aqueous humor from draining properly through the trabecular meshwork. The angle may be narrow from birth, or it may decrease as a result of the aging process. As you age, the lens of your eye grows larger, decreasing the space between the iris and the cornea. An accident or blow to the eye may also cause the angle to narrow, as well as development of blood vessels caused by diabetes.
Whatever the cause of the narrow angle, dilated pupils can cause your angle to close and trigger a sudden increase in intraocular pressure. Many things can cause your pupils to become dilated such as darkness or low light levels, stress or excitement, and certain medications including antihistamines, tricyclic antidepressants and dilating eye drops.
If you experience any of the following symptoms, you should immediately contact your ophthalmologist as immediate treatment may save your sight:
- Inflammation and severe pain
- Blurred vision
- Halos around lights
- Nausea and vomiting
During your routine eye examinations, your ophthalmologist will use a mirrored lens to see if the trabecular meshwork is in danger of becoming blocked. If this exam determines that you are risk for acute narrow angle glaucoma, a preventative Laser Peripheral Iridotomy (LPI) may be recommended.
Overview of Glaucoma
Open Angle Glaucoma
Medical Treatment for Open Angle Glaucoma
Laser Treatment for Open Angle Glaucoma
Surgery for Open Angle Glaucoma
Narrow Angle Glaucoma
Laser Treatment for Narrow Angle Glaucoma
Neovascular Glaucoma
Inflammatory Glaucoma
