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Page 2: Laser Eye Surgery - Weighing Up the Pros and Cons | We Care

Laser Iridotomy

What is a Laser Iridotomy

Closed-angle (of pupillary-block) glaucoma is one of many types of glaucoma. Often it can be cured through a procedure called an iridotomy. To better understand closed-angle glaucoma and its treatment, iridotomy . it is important to understand the different factors which determine eye pressure.

In laser iridotomy, a small hole is placed in the iris (the colored portion of the eye). In most patients, the iridotomy is placed in the upper portion of the iris and cannot be seen under the upper eyelid.

What is eye pressure?

Aqueous humor (the nourishing fluid within the front of the eye) leaves the eye through a tiny drain called the trabecular meshwork.

Aqueous humor leaves the eye through a tiny drain called the trabecularmeshwork, which is located just in front of the iris.

Page 3: Laser Eye Surgery - Weighing Up the Pros and Cons | We Care

Pupillary-Block Glaucoma

The blockage of fluid flow between the iris and lens can cause the pressure behind the iris to rise. As it rises, the iris is pushed forward. If it moves forward enough, the iris can cover trabecular meshwork like a rubber stopper in a drain.Sometimes a patient is unaware of the pupillary-block. However, the eye may become red. A patient also may experience headache or pain, blurred vision, and halos around lights. Rarely, there is nausea..

How do lasers work to treat glaucoma?

Lasers deliver a type of light energy. This type of light energy is similar to using a magnifying glass to harness the energy of the sun to burn a hole in a piece of paper on a sunny day. The magnifying glass needs to properly focus the light to create a hole in the paper. Likewise, if the laser is not aimed properly at the iris, there is no effect. In order to focus the laser, your eye doctor uses an instrument called a slit-lamp..

Page 4: Laser Eye Surgery - Weighing Up the Pros and Cons | We Care

How is laser iridotomy performed?

Before having an iridotomy, your ophthalmologist may place some different types of drops on your eye. The first drop, pilocarpine, will make your pupil smaller. This stretches and thins your iris, similar to stretching out the top surface of a drum. By doing this, it is easier for the laser to penetrate and make a hole in your iris. You may be asked to continue using this eye drop for a few days following the laser treatment. This medication may temporarily cause blurred vision (especially at night) and also may give you a brow-ache..

What to expect after an iridotomy.

After treatment, your doctor may ask you to stay for a few hours to check your eye pressure and insure that it has not increased.When it is safe, you will be sent home and may be asked to use eye drops. Your ophthalmologist will explain their use and when you need to be examined again..

Page 5: Laser Eye Surgery - Weighing Up the Pros and Cons | We Care

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