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Redmond Regional Medical Center

Open-Angle Glaucoma


Glaucoma describes a group of eye disorders that causes damage to the optic nerve. This degenerative eye disease is one of the leading causes of chronic blindness in the United States. Open-angle glaucoma is the most common form of glaucoma.

Open-angle glaucoma can often be controlled well with proper treatment, and most patients who receive treatment will maintain their vision.

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Open-angle glaucoma is caused by increased intraocular pressure. Within the eye, fluid is made and then drained from the eye. If either the fluid is made too quickly (not common) or drains too slowly, then the pressure of the eye can increase, leading to damage to the optic nerve.

This damage to the optic nerve can lead to a decrease in peripheral vision and may eventually cause blindness.

Risk Factors

The risk of glaucoma increases with age. Glaucoma is more common in African American and Hispanic people. Other factors that may increase your chance of getting glaucoma include:

  • Family history of glaucoma
  • Glaucoma in one eye—This increases the risk of developing glaucoma in the other eye.
  • Increased intraocular pressure
  • Diabetes
  • High blood pressure
  • Migraine
  • Injury to the eye
  • Certain eye abnormalities, such as congenital defects


Many patients with open-angle glaucoma experience few or no symptoms until the disease has progressed to the very late stages. Visual symptoms may include:

  • Loss of peripheral vision
  • Tunnel vision
  • Blindness
  • Rainbows or halos

Other symptoms may include:

  • Red eyes
  • Headache
  • Nausea or vomiting


Your doctor will ask about your symptoms and medical history. A physical exam will be done.

Tests may include:

  • Eye exam with pupil dilation
  • Tonometry—a test to determine intraocular pressure
  • Visual field test to determine vision loss
  • Slit lamp examination—the use of a low-power microscope combined with a high-intensity light source, allows a narrow beam that can be focused to examine the front of the eye
  • Photographs of the optic nerve
  • Gonioscopy—to examine the outflow channels of the angle
  • Analysis of the nerve fiber layer around the optic nerve


The goal of treatment is to reduce intraocular pressure. Talk with your doctor about the best treatment plan for you. Options include:

  • Medications:
    • Eye drops, and rarely pills, are often administered to reduce intraocular pressure
    • They work by reducing the amount of fluid eye produced or increasing the flow
    • They may cause side-effects
    • Talk to your doctor about your specific medication
  • Laser treatment
    • Laser treatment may be used to reduce intraocular pressure
    • It works by increasing the flow of fluid
    • This is used along with medications.
  • Surgery—Surgery may be done to open a new outflow channel from the eye.


Open-angle glaucoma can't be prevented. Regular eye exams are important to screen for eye conditions such as glaucoma. How often glaucoma needs to be screened for increases with age.

Revision Information

  • The Glaucoma Foundation

  • Glaucoma Research Foundation

  • Glaucoma Research Society of Canada

  • The Canadian Ophthalmological Society

  • Facts about glaucoma. National Eye Institute website. Available at: Accessed May 10, 2016.

  • Open-angle glaucoma. EBSCO DynaMed website. Available at: Updated April 25, 2016. Accessed May 10, 2016.

  • What is glaucoma? American Academy of Ophthalmology website. Available at: Updated February 14, 2014. Accessed May 10, 2016.

  • What is glaucoma? Glaucoma Research Foundation website. Available at: Updated February 18, 2014. Accessed May 10, 2016.

  • Weinreb RN, Khaw PT. Primary open-angle glaucoma. Lancet. 2004;363:1711.

  • Vision screening recommendations for adults 40 to 60. American Academy of Ophthalmology Eye Smart website. Available at: Updated March 3, 2014. Accessed May 10, 2016.

  • Vision screening recommendations for adults over 60. American Academy of Ophthalmology Eye Smart website. Available at: Updated March 3, 2014. Accessed May 10, 2016.

  • Vision screening recommendations for adults under 40. American Academy of Ophthalmology Eye Smart website. Available at: Updated July 17, 2012. Accessed May 10, 2016.

The health information in this Health Library is provided by a third party. Redmond Regional Medical Center does not in any way create the content of this information. It is provided solely for informational purposes. It does not constitute medical advice and is not intended to be a substitute for proper medical care provided by a physician. Always consult with your doctor for appropriate examinations, treatment, testing, and care recommendations. Do not rely on information on this site as a tool for self-diagnosis. If you have a medical emergency, call 911.