During trabeculectomy—sometimes also called filtration surgery—a piece of tissue in the drainage angle of the eye is removed, creating an opening. The opening is partially covered with a flap of tissue from the sclera, the white part of the eye, and the conjunctiva, the clear thin covering over the sclera. This new opening allows fluid (aqueous humor) to drain out of the eye, bypassing the clogged drainage channels of the trabecular meshwork.
As the fluid flows through the new drainage opening, the tissue over the opening rises to form a little blister or bubble, called a bleb. The bleb is located where the sclera, or white of the eye, joins the iris, the colored part of the eye. During office visits after surgery, the doctor looks at the bleb to make sure that fluid is still draining out of the new opening. Not all blebs have to be easily seen to work.
The new opening created by trabeculectomy allows fluid to gather under the tissue that lines the eyeball (conjunctiva), where it is absorbed into the bloodstream.
This procedure lowers pressure inside the eye. But some people need another trabeculectomy surgery or other treatments for glaucoma. Trabeculectomy is less likely to be successful in:
The long-term effectiveness of trabeculectomy surgery in preventing loss of vision from glaucoma is less certain. It is not a cure. And visual field loss can continue despite surgery.
Surgery can be stressful. This information will help you understand what you can expect. And it will help you safely prepare for surgery.
The most common problem after a trabeculectomy is scarring of the opening. Scarring prevents fluid drainage from the eye and interferes with the proper function of the bleb. If the bleb doesn't work or causes problems, more surgery may be needed.
The medicine mitomycin is commonly used during surgery to prevent scarring. It is more commonly used than 5-fluorouracil, but it cannot be used after surgery. 5-fluorouracil can be used during the surgery or injected into the thin tissue (conjunctiva) covering the eye after surgery to prevent scarring.
Other complications of this surgery that may develop soon after surgery include:
Late complications after a trabeculectomy may include:
Most people don't have to be admitted to the hospital. But children who have the surgery may stay in the hospital overnight. And in some cases, your doctor may recommend that you stay in the hospital.
Right after surgery, antibiotics may be applied to the eye. They may also be injected under the lining of the eyelid (conjunctiva). After surgery, the eyelid is usually taped shut, and a hard covering (eye shield) is placed over the eye. A dressing is worn over the eye during the first night after surgery. You'll wear the eye shield at bedtime for up to a month. Corticosteroid medicines are usually applied to the eye for about 1 to 2 months after surgery to decrease inflammation in the eye.
You will probably have a checkup with your eye specialist the day after surgery.
Any activity that might jar the eye needs to be avoided after surgery. People usually need to avoid bending, lifting, or straining for several weeks after surgery.
After surgery, people who have problems with constipation may need to take laxatives to avoid straining while trying to pass stools. Straining can raise the pressure inside the eye (intraocular pressure). This can cause problems with the new opening that was made during surgery to drain fluid from the eye. These problems can increase the pressure in your eye even more and increase the risk of infection.
Usually there is mild discomfort after a trabeculectomy. Severe pain may be a sign of complications. If you have severe pain after your surgery, call your doctor right away.
Call 911 anytime you think you may need emergency care. For example, call if:
Call your doctor now or seek immediate medical care if:
Watch closely for any changes in your health, and be sure to contact your doctor if:
You had a trabeculectomy to treat glaucoma. Pressure in the eye can lead to vision problems. This type of surgery is one way to lower the pressure in the eye.
After surgery, your eye may be red and irritated. It may also water more than usual or swell a little. Even though your eye may be uncomfortable, it's important not to rub it. Rubbing your eye could damage it.
A dressing is worn over the eye during the first night after surgery. You'll wear an eye shield at bedtime for up to a month.
You will probably be able to return to work or your normal routine 1 to 2 weeks after surgery. In most cases, the new opening (bleb) in your eye will be covered by your upper eyelid and will not be visible.
For a few weeks, you may see your doctor several times a week to check how well fluid is draining out of your eye. Depending on the pressure in your eye, your doctor may cut the stitches around your bleb to change the flow of fluid.
Your eyes may be blurry for up to 6 weeks after surgery. As this goes away, your vision will probably be as good as it was before surgery. But you may need to change your glasses or contact lenses. Certain kinds of glasses and contacts may be better for your eye after this surgery.
If you need them, your doctor will recommend or prescribe pain medicines. The doctor will also give you eyedrops and may prescribe medicines to prevent the bleb from scarring.
Trabeculectomy is used to treat open-angle glaucoma and chronic closed-angle glaucoma. Trabeculectomy is usually done when medicine or laser treatment or both have failed to reduce the pressure in the eyes enough to prevent damage to a person's eyesight.
Trabeculectomy is not the first surgery used for treating children who have childhood glaucoma.
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