Glaucoma - Eye Surgery


Glaucoma is a popular eye condition where the optic nerve, which connects the eye to the brain, gets damaged. It's usually a result of fluid building up in the front part of the eye, which increases pressure within the eye.

Glaucoma can cause loss of vision if it's not diagnosed and treated early. It can affect persons of all ages but is mainly common in adults in their 70s and 80s.

Glaucoma Surgery

All glaucoma surgical procedures (whether laser or non-laser) are designed to accomplish one of two primary results: decrease the production of intraocular fluid aqueous humour or increase the outflow (drainage) of the same fluid. Periodically, a procedure will accomplish both.

Currently, the goal of glaucoma surgery and other glaucoma treatments is to lower or stabilize intraocular pressure (IOP). When this goal is accomplished, damage to ocular structures — especially the optic nerve — may be avoided.

If medicine or laser surgery does not ease eye pressure, a patient may need glaucoma surgery. There are various options.

Filtering Surgery

Filtering surgery creates a new approach through the eye's tissues to let fluid drain from the eye.

In the most common filtering surgery, called a trabeculectomy or a sclerotomy, the surgeon makes a small hole in the white part of the eye (the sclera) to create a new outflow path. The fluid then flows through the new hole and creates a bleb, which is like a small bubble or pool on the surface of the eye. The bleb holds the fluid while it is gradually absorbed into the surrounding tissue. The upper eyelid normally hides the bleb, so it's not noticeable to you or others.

Some persons who have this procedure no longer need medicine after surgery. Some people treated still need medicine, but they have better pressure control after the operation. Around 15 percent do not benefit from filtering surgery.

An alternative type of glaucoma surgery may occasionally be carried out in which the tissues over the drainage region are thinned but not fully penetrated. This procedure can produce less complication than trabeculectomy but also may be less effective in achieving low intraocular pressures.

Drainage Implant Surgery

Drainage implant surgery is sometimes carried out when a person is not eligible for filtering surgery or when earlier filtering surgery has failed. Depending on the type of implant used, the surgery is called valve, shunt or seton surgery.

In these procedures, the surgeon inserts a tiny tube through the sclera into the front area of the eye behind the iris. This tube becomes a path for fluid to drain off. The other end of the tube is joined to a tiny reservoir that acts like the bleb to hold fluid until it is absorbed into the surrounding tissue. The reservoir is positioned on the surface of the eye, back between the eye muscles, so it is not visible.

Right after filtering or drainage implant surgery, a person can have a temporary reduction of vision. Vision usually improves over several weeks to its former level. It also takes time to recover from either form of surgery. For example, in the weeks after surgery, people must always avoid getting water into their eyes, reading, bending, lifting heavy objects and driving.


Canaloplasty is the latest procedure to lower pressure that is performed within the eye wall but does not actually penetrate the eye. While this procedure is safer than filtering surgery, it does not supply as profound a reduction in IOP.

Minimal Invasive Glaucoma Surgeries

Minimal Invasive Glaucoma Surgeries are a set of newer FDA-approved operations that reduce pressure. These methods currently include the Trabectome and the iStent. Both of these approaches work by bypassing the blockage in the drain of the eye to aid fluid flow through the natural drain and do not need "artificial" pathways for fluid drainage to regions outside the eye. Like canaloplasty, the procedures are less risky than filtering surgery but do not supply as profound a reduction in IOP. More long-term data is required to determine how well they work beyond the first early years. The use of Minimal Invasive Glaucoma Surgeries is still being debated among glaucoma specialists but can have applications that are specific to patients.

Laser Cyclophotocoagulation

Laser Cyclophotocoagulation is used for intense cases of glaucoma. It removes tiny areas of the ciliary body that make aqueous fluid. This "turns down the faucet." Laser cyclophotocoagulation needs a numbing block to the eye to prevent pain with the procedure.

Risks of Glaucoma Surgery

Glaucoma surgeries have some possible risks, such as:

·       A higher risk of getting cataracts

·       Infection or leaking of the incision

·       Too low pressure

·       Hemorrhages inside the eye

Unfortunately, the new drainage path can close, leading to pressure in the eye to rise again. Filtering surgery can be repeated with good outcomes. Also, drainage implants are usually successful in patients whose filtering surgery has failed. The medicines that reduce inflammation and control scar formation after surgery have assisted in increasing the success of glaucoma surgeries.

Frequently Asked Questions (FAQs)

What are the symptoms of glaucoma?


Glaucoma often develops without noticeable symptoms in the early stages. However, as the condition progresses, it may cause gradual vision loss, peripheral vision problems, eye pain, and halos around lights.


Who is at risk of developing glaucoma?


People over the age of 60, individuals with a family history of glaucoma, those with certain medical conditions (such as diabetes), and individuals of African, Hispanic, or Asian descent are at higher risk of developing glaucoma.


How is glaucoma diagnosed?


Glaucoma is typically diagnosed through a comprehensive eye examination that includes measuring eye pressure, assessing the optic nerve, and evaluating peripheral vision.


What are the treatment options for glaucoma?


Glaucoma treatment aims to lower eye pressure and may include eye drops, oral medications, laser therapy, or surgery, depending on the severity of the condition.


Can glaucoma be prevented?


While glaucoma cannot be entirely prevented, early detection and treatment can help slow down the progression of the disease and minimize vision loss.


How often should I get my eyes checked for glaucoma?


It is recommended to have regular comprehensive eye examinations, including eye pressure measurements and optic nerve evaluations, every 1-2 years for individuals aged 40 and above, and more frequently for those at higher risk.


Can lifestyle changes help manage glaucoma?


Although lifestyle changes cannot cure glaucoma, maintaining a healthy lifestyle, including regular exercise, a balanced diet, and avoiding smoking, may help support overall eye health.


DisclaimerThe information provided herein is for patient general knowledge only and should not be used during any medical emergency, diagnosis or treatment of any medical condition. Duplication for personal and commercial use must be authorized in writing by

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