Argon Laser Trabeculoplasty (ALT)

Argon Laser Trabeculoplasty (ALT) is a laser procedure used to treat open-angle glaucoma by lowering intraocular pressure (IOP). The trabecular meshwork is the eye's natural drainage system, and in open-angle glaucoma, this drainage system becomes less efficient over time, causing fluid to build up and pressure to increase. ALT uses a focused argon laser beam to create small burns in the trabecular meshwork, stimulating adjacent tissue to open up the drainage channels and improve fluid outflow, thereby reducing eye pressure.

The procedure is performed in the outpatient clinic and takes approximately 10 to 15 minutes per eye. Before treatment, numbing eye drops are applied to ensure comfort. A special contact lens is placed on the eye to help focus the laser and keep the eyelids open. You may see flashes of bright light during the procedure, but you should not feel pain — only a slight sensation of pressure from the contact lens. Most patients can go home immediately after the procedure.

ALT is typically considered when eye drops are not sufficiently controlling eye pressure, or when patients experience side effects from glaucoma medications. It can also be used as an initial treatment in certain cases, potentially reducing or eliminating the need for daily eye drops. The effects of ALT are not permanent — typically lasting 1 to 5 years — but the procedure can sometimes be repeated if pressure begins to rise again.

After the procedure, you may experience mild irritation, blurred vision, or light sensitivity for a few hours. Your doctor will prescribe anti-inflammatory eye drops to use for several days. A follow-up appointment is usually scheduled within 1 to 2 weeks to check your eye pressure and assess the treatment's effectiveness. Most patients return to normal activities the day after the procedure.

At International Eye Hospital, ALT is one of several advanced glaucoma treatment options we offer. Our specialists carefully evaluate each patient to determine whether laser therapy, medication, or surgical intervention is the most appropriate approach for managing their glaucoma and preserving vision.