Wednesday, November 21, 2012

Glaucoma (Eyes)

Part of eye
Glaucoma is a condition that causes damage to your eye’s nerve and gets worse over time.  It’s often associated with the buildup of pressure inside the eye. Glaucoma tends to be inherited and may not show up until later in life.

The increased pressure, called intraocular pressure, can damage the optic nerve, which transmits images to the brain. If damage to the optic nerve from high eye pressure continues, glaucoma will cause permanent loss of vision. Without treatment, glaucoma can cause total permanent blindness within few years.
Most of people with glaucoma have no early symptoms or pain from increased pressure, it it important to see your eye doctor regularly so that glaucoma can be diagnosed and treated before long-term visual loss occurs.
If you are over the age of 40 and if you have a family story of glaucoma, you should have a complete eye exam with an eye doctor every one to two years. If you have health problems such as diabetes or a family history of glaucoma or are at risk for eye diseases, you may need to visit your eye doctor more frequently

Why does pressure rise in the eye to cause glaucoma?
Glaucoma usually occurs when pressure in your eye increases. This can happen when eye fluid isn’t circulating normally in the front part of the eye.
Normally, this fluid, called aqueous humor, flow out of the eye through a mesh-like channel. If this channel becomes blocked, fluid builds up, causing glaucoma. The direct cause of this blockage is unknown, but doctors do know that it can be inherited, meaning it is passed from parents to children.
Less common causes of glaucoma include a blunt or chemical injury to the eye, severe eye infection, blockage of blood vessels n the eye, inflammatory conditions of the eye, and occasionally eye surgery to correct another condition. Glaucoma usually occurs in both eyes, but it may involve each eye to different extent.

Type of glaucoma
2 main types of glaucoma
            -Open-angle glaucoma-also called wide-angle glaucoma; this is the most common type of glaucoma. The structures of the eye appear normal, but fluid in the eye doesn’t flow properly through the drain of the eye, called the trabecular meshwork.
            -Angle-closure glaucoma; also called acute or chronic angle-closure or narrow-angle glaucoma. This type of glaucoma is less common but can cause a su8dden buildup of pressure in the eye. Drainage may be poor because the angle between the iris and the cornea (where a drainage channel for the eye is located) is too narrow.

Who gets glaucoma?
Glaucoma most often occurs in adults over age 40, but it can also occur in young adults, children, and event infants. In African-Americans, glaucoma occurs more frequently and at an earlier age and with greater loss of vision.
You are at an increased risk of glaucoma if you:
-are African-American, irish, Russian, Japanese, Hispanic, inuit, or Scandinavian descent
-are over age 40
Have a family story of glaucoma.
-have poor vision
-have diabetes.
-take certain steroid medications, such as prednisone

What are the symptoms of glaucoma?
For most people, there are usually few or no symptoms of glaucoma. The first sign of glaucoma is often loss of peripheral or side vision, which can go unnoticed until late in the disease. Detecting glaucoma early is one reason you should have a complete exam with an eye specialist every one to two years. Occasionally, intraocular pressure can rise to severe levels. In these cases, sudden eye pain, headache, blurred vision, or the appearance of halos around lights may occur.
If you have any of the following symptoms, seek immediate medical care:
-seeing halos around lights
-vision loss
-Redness in the eye
-eye that looks hazy (particularly in infants)
-nausea or vomiting
-Pain in the eye
-Narrowing of vision (tunnel vision)

How is glaucoma diagnosed?
To diagnose glaucoma, an eye doctor will test your vision and examine your eyes through dilated pupils. The eye exam typically focuses on the optic nerve which has a particular appearance in glaucoma. In fact, photographs of the optic nerve can also be helpful to follow over time as the optic nerve appearance changes as glaucoma progresses. The doctor will also perform a procedure called tonometry to check for eye pressure and a visual field test, if necessary, to determine if there is loss of side vision. Glaucoma tests are painless and take very little time.

Glaucoma treatetment
-Eye drops for glaucoma.-these either reduce the formation of fluid in the front of the eye or increased its outflow. Side effects of glaucoma drops may include allergy, redness of the eyes. Some glaucoma drugs may affect the hearth and lungs. Be sure telling your doctor about any other medications you are currently taking or are allergic to.

-Laser surgery for glaucoma.-lase surgery for glaucoma slightly increased the outflow of the fluid from the eye in open-angle glaucoma or eliminates fluids blockage in angle-closure glaucoma. Types of laser surgery for glaucoma include trabeculoplasty, in which a laser is used to pull open the trabecular meshwork drainage area; iridotomy, in which a tiny hole is made in the iris, allowing the fluid to flow more freely; and cyclophotocoagulation, in which a laser beam treats areas of the middle layer of the eye, reducing the production of fluid.

-Microsurgery for glaucoma.- in an operation called a trabeculectomy, a new channel is created to drain the fluid, thereby reducing intraocular pressure that causes glaucoma. Sometimes this form of glaucoma surgery fails and must be redone. For some patients, a glaucoma implant is the best option. Other complications of microsurgery for glaucoma include some temporary or permanent loss of vision, as well as bleeding or infection.

Open-angle glaucoma is most commonly treated with various combinations of eye drops, laser trabeculoplasty, and microsurgery. Traditionally in the u.s., medications are used first, but there are increasing evidence that some people with glaucoma may respond better with early laser surgery or microsurgery
Infant or congenital glaucoma (meaning you are born with it) is primarily treated with surgery since the cause of the problem is a very distorted drainage system.
Talk to your doctor to find out which glaucoma treatment is right for you.


Can glaucoma be prevented?
Glaucoma cannot be prevented but if it is diagnosed and treated early, the disease can be controlled.

What is the outlook for people with glaucoma?
At this time, loss of vision caused by glaucoma is irreversible and cannot be restored. However, successfully lowering eye pressure can help prevent further visual loss from glaucoma. Most people with glaucoma do not go blind as long as they follow their treatment plan and have regular eye exams

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