Provide a valuable resource to your clients or customers by linking to this resource page. Just place the following link on your website.
Argon Laser Trabeculoplasty, or ALT, is a laser procedure used to help lower eye pressure in people with open-angle glaucoma. It uses a focused argon laser to treat the trabecular meshwork, the structure responsible for draining fluid from the eye. The treatment stimulates this area so fluid can move more efficiently. The procedure is done in a clinic and does not require any incisions.
read more about argon laser trabeculoplasty alt ...ALT is performed when eye pressure remains high despite the use of medicated eye drops. It helps increase drainage, which can protect the optic nerve from pressure-related damage. Many providers recommend it as an additional step before considering more invasive treatments. It is commonly chosen for certain types of glaucoma.
The argon laser creates small, controlled spots on the trabecular meshwork. These spots help open drainage channels that may be less effective. As fluid moves more freely, eye pressure can decrease. The effect develops gradually over several weeks.
ALT uses a continuous-wave argon laser, while SLT uses short pulses of low-energy light. SLT targets the same tissue but is gentler on surrounding structures. Some patients respond better to one treatment than the other. Providers choose based on the patient's pressure levels and response to past treatments.
Numbing drops are used to help reduce discomfort. A special lens is placed on the eye to help guide the laser. Patients may see brief flashes of light during the procedure. Mild redness or blurred vision can occur afterward but usually fades quickly.
The pressure drop is often gradual rather than immediate. Many people see changes over the next few weeks as the drainage area responds. Follow-up visits are used to track pressure and decide if drops still need adjustment. Results can vary, so monitoring is part of the plan.
Sometimes, yes. If ALT lowers pressure enough, your doctor might reduce or change medications. Other times, it's used to boost control while staying on the same drops. The goal is reaching a safer pressure for the optic nerve. Your response determines whether drop changes make sense.
It depends on how the trabecular meshwork responds and what was done before. Some eyes don't respond as well to repeat ALT, and that's one reason SLT is often considered. Your glaucoma specialist looks at pressure history and angle findings before recommending another laser. If ALT isn't enough, other options exist.
Mild redness, scratchy feeling, or blur can happen for a short time. Some people have a temporary pressure spike, which is why pressure checks after the procedure are common. Anti-inflammatory drops are sometimes used to calm irritation. If severe pain or sudden vision change happens, it should be reported right away.
1. Laser Trabeculoplasty for Open-Angle Glaucoma (Ophthalmic Technology Assessment). American Academy of Ophthalmology.
2. Laser trabeculoplasty (patient education). Glaucoma Research Foundation.
3. Open-angle glaucoma: laser procedures for lowering eye pressure (patient education). National Health Service (NHS).
4. Selective Laser Trabeculoplasty (SLT) and pressure-lowering laser care (audio/education). American Academy of Ophthalmology. https://www.aao.org/education/audio/direct-selective-laser-trabeculoplasty-in-open-ang. October 23, 2025.
5. Laser treatment for glaucoma (clinical overview). StatPearls. NCBI Bookshelf (NIH).
6. Argon laser trabeculoplasty outcomes and comparisons (peer-reviewed research). Ophthalmology (journal).