What is laser iridotomy?

Laser iridotomy uses a very focused beam of light to create a hole on the outer edge, or rim, of the iris, the colored part of the eye. This opening allows fluid (aqueous humor) to flow between the anterior chamber, the front part of the eye, and the area behind the iris, the posterior chamber. This opening may decrease pressure in the eye and usually prevents sudden buildup of pressure within the eye, which occurs during an episode of acute closed-angle glaucoma.

Some people feel a mild but sharp sensation in the eye during this procedure. But there usually is no pain after laser iridotomy.

Laser iridotomy may prevent further episodes of sudden (acute) closed-angle glaucoma. It also may prevent slow-forming (subacute) closed-angle glaucoma in people who are at risk for the condition.

Complications of laser iridotomy may include:

• Brief blurred vision (common).
• Swelling of the clear covering (cornea) of the iris.
• Bleeding.
• Increased pressure in the eye.

Later complications may include:

• Further clouding of the lens (cataract) compared to what was present before laser treatment.
• Closure of the opening.
• Recurrent closed-angle glaucoma.
• Development of another type of glaucoma.
• Continuing need for medicines (depends on the person's condition before laser treatment).
• Glare or double vision from light entering through the new opening.

Laser iridotomy can be done without a hospital stay. You may need to stay for a few hours after your procedure. The doctor will need to make sure your eye pressure isn't going up. You will also need to see the doctor for a follow-up exam as recommended.

Laser iridotomy is mainly used to try to:

• Treat closed-angle glaucoma after the pressure in the affected eye has been reduced with medicine or when medicines fail.
• Prevent closed-angle glaucoma in people who have narrow drainage angles and those people who have had closed-angle glaucoma in their other eye.