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What Is Glaucoma? 5 Things You Should Know

August 20, 2014

According the World Health Organization, glaucoma is the second leading cause of blindness in the world. Although an estimated 2.2 million Americans live with glaucoma, nearly half are not aware of it. There is no cure for glaucoma, so it is imperative to diagnose it as early as possible in order to prevent further damage to the eye.


Unfortunately, many people are not well-informed about glaucoma and therefore do not understand its risks if left untreated. The most effective for detecting glaucoma is a dilated eye exam, a procedure that uses a tonometer to measure the fluid and pressure in the patient’s eye. However, dilated eye exams are performed less often than they should be, even among people who go to the eye doctor regularly. Therefore, it is important to be informed and aware of the risks of glaucoma. Here are five things you should know about it:

1. Glaucoma is caused by a buildup of pressure in the eye.

Intraocular pressure maintains the balance of the vitreous and aqueous fluids in the eye. Vitreous humor, found at the back of the eye, holds the retina in place. It is present at birth and generally does not move throughout a person’s lifetime. Aqueous humor is found at the front of the eye and circulates through it in order to clean and nourish the lens. The ciliary body, also located at the front of the eye, is responsible for producing aqueous humor. In a healthy eye, fluid is produced and circulated at the same rate at which it is drained.


Fluid in the aqueous humor first drains through the Trabecular Meshwork, an opening at the angle where the iris and the cornea meet. Fluid drains through this soft tissue and into the Schlemm’s Canal, where it enters the bloodstream. If these areas are blocked, closed, or otherwise unable to drain fluid as quickly as it is produced, pressure begins to build within the eye, causing immediate or gradual damage to the optic nerve.

2. It may take many years to show symptoms of glaucoma.

Although some types of glaucoma may cause immediate and significant changes in vision, this is not always the case. Vision loss due to glaucoma is often a gradual process as a person’s eyesight begins to narrow and worsen. Other symptoms include: “halos” around lights, tunnel vision, eye pain, redness, headaches, blurriness, hazy or cloudy eyes, and loss of peripheral vision.


3. Glaucoma comes in many different forms.

  • Primary (or chronic) open-angle glaucoma: This is most common form of glaucoma. It occurs when fluid drains too slowly from the eye despite the opening at the cornea and the iris being open and unblocked. Over time, intraocular pressure builds. Because open-angle glaucoma develops gradually, it is often painless and can cause vision loss before symptoms become apparent. iStent is an approved treatment for early stage open-angle glaucoma that helps alleviate the eye pressure.
  • Angle-closure glaucoma: Although this form is less common than open-angle glaucoma, it is a much more dangerous condition as it can lead to immediate vision loss. In this type of glaucoma, the opening at the angle where the iris and cornea meet closes and fluid is unable to drain from the front of the eye, causing intraocular pressure to build up very quickly.

Angle closure glaucoma can be caused by structural abnormalities in the eye, a small opening, age, dilated pupils, and significant increases in pressure in a short amount of time. Symptoms include severe eye pain, nausea, bloodshot eyes, and blurry vision. If you experience any of these symptoms, seek immediate medical help. If quickly treated, it is likely the pressure can be relieved, preventing further damage. If untreated, blindness can occur.

  • Secondary: Although open- and closed-angle glaucoma are often the result of the aging process, they can also develop as a side effect of another condition including injury to the eye, medications, disease, and abnormalities in the eye. If so, it is said to be secondary glaucoma.
  • Low-tension: In many glaucoma patients, the optic nerve becomes damaged despite their intraocular pressure being within the normal range. Although the exact cause of low-tension glaucoma is unknown, some researchers suggest that it may be associated with hypersensitive optic nerves or reduced blood flow to the eyes.
  • Congenital: Some individuals are born with abnormalities in their eyes that prevent them from draining properly. Symptoms of congenital glaucoma are usually easy to recognize and include light sensitivity, hazy or cloudy eyes, and excessive production of tears. If successfully treated, babies born with this condition are likely to have good vision late in life. However, if not treated, congenital glaucoma can lead to blindness.

4. There is no cure for glaucoma.

Additionally, damage done to the optic nerve as a result of glaucoma cannot be reversed. Even after undergoing treatment, patients must be monitored to make sure the aqueous humor drains properly.

5. However, there are treatment options to slow the onset of glaucoma and prevent further damage to the optic nerve.

For many people, pills and medicated eye drops may effectively treat their glaucoma. For others, surgery may be the best option. A selective laser trabeculoplasty, a procedure performed here at OCLI, uses an ultra-low frequency laser to target the Trabecular Meshwork, allowing fluid to drain correctly and relieving pressure in the eye. A second procedure, an endoscopic cyclophotocoagulation (ECP), targets the ciliary body in order to reduce the amount of fluid produced. The reduction in the volume of fluid in the eye allows the aqueous humor to drain at the same rate at which it is made.

Keep in mind that everyone one is different. Some individuals whose intraocular pressure falls within the normal range develop glaucoma, whereas people with high intraocular pressure never sustain any damage to their optic nerve. If you have noticed any symptoms or think that you may be at risk to develop glaucoma, consult your eye care specialist at OCLI.

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