SLT Laser Treatment: The Low Stress Glaucoma Therapy

Can a five-minute laser therapy really keep your glaucoma under control?

I’m Dr Mitch Lee, Principal Ophthalmologist here at Eagle Eye Surgeons in Sydney. I am a surgical retina specialist, and also have extensive experience in glaucoma care, cataract surgery, and laser vision correction. I’ve see firsthand how many people feel overwhelmed by the idea of lifelong eye drops or invasive surgery. That’s why I often recommend SLT laser treatment. It’s a non-invasive, quick, and repeatable option that helps lower intraocular pressure—the key to slowing glaucoma progression.

In this article, I’ll walk you through how SLT works, who it suits best, and what you can realistically expect from it.

Key Takeaways

• SLT laser treatment lowers eye pressure in open-angle glaucoma without cutting or damaging tissue.
• The procedure is quick, painless, and performed in-office with minimal recovery time.
• SLT can reduce or eliminate the need for daily glaucoma eye drops.
• It’s a repeatable, long-term option for managing glaucoma and delaying more invasive treatments.

What Is SLT Laser Treatment and How Does It Work?

Why choose a laser when eye drops already exist? That’s a question I get a lot. And it’s a fair one, especially when you’re being asked to put your trust in something that sounds more like science fiction than medical care.

SLT, short for Selective Laser Trabeculoplasty, is a non-invasive laser treatment for open-angle glaucoma. Rather than cutting or removing anything, the laser delivers short pulses of light to specific cells in the eye’s drainage system—the trabecular meshwork. These cells absorb the light and respond by improving fluid flow, which helps reduce intraocular pressure (IOP).

Who Is a Good Candidate for SLT?

Can laser treatment really replace the daily grind of glaucoma drops? In many cases, yes, and it’s one of the reasons I offer SLT to so many of my patients.

It’s especially effective for people with open-angle glaucoma or ocular hypertension, where pressure builds slowly but steadily over time. If you’re finding it hard to stick to daily drops, or your eyes react badly to the preservatives in them, SLT might be a better fit. It’s also a strong option as a first-line treatment. Some patients choose to skip drops entirely and go straight to laser.

That said, it’s not for everyone. SLT isn’t recommended if you’ve got angle-closure glaucoma, significant scarring in the drainage angle, or if your eye is inflamed. In those cases, we’d need to explore other treatments more suited to your specific eye structure.

The decision really comes down to your pressure levels, eye anatomy, and lifestyle. That’s why I always carry out a full exam and chat through your options before recommending anything.

Benefits of SLT Laser Treatment

What makes SLT stand out from all the other glaucoma treatments? For many of my patients, it’s the sheer relief of simplifying their routine.

SLT is done in the clinic. No hospital gowns. No overnight stays. No stitches. You walk in, have the treatment, and go home shortly after. Most people are back to their usual activities the next day. It’s a low-hassle option that doesn’t rely on your ability to remember drops twice a day, every day, forever.

It’s also repeatable. That’s a major plus. Unlike some older laser treatments, SLT doesn’t burn tissue, so if your pressure creeps back up a few years later, we can often do it again. And the evidence supports its use. Studies like the LiGHT trial have shown SLT is just as effective as drops for many people and can even reduce the need for further procedures.

In the long run, that can mean fewer side effects, less eye surface irritation, and better pressure control.

What to Expect During the Procedure

How long does it take to laser an eye? Surprisingly, not long at all.

When you come in for SLT, we start by checking your eye pressure and having a look at the front structures of your eye. Then we pop in a few anaesthetic drops to numb the surface—no needles, no sedation. You’ll sit at a laser machine that looks a lot like the one we use for standard eye exams. A special lens is placed on the eye to help focus the laser precisely where it’s needed.

The laser itself takes just 10 to 15 minutes. You might notice a flash of light or a slight stinging sensation, but most people say it feels no worse than a puff of air test. There’s no cutting, and nothing actually enters the eye. Afterward, we’ll check your pressure again and let you rest briefly before heading home.

Recovery and Aftercare

How soon can you get back to normal after laser treatment? For most people, the answer is almost immediately.

After SLT, your vision might be a little blurry, and your eye could look red for a day or two. That’s expected. Some patients feel a bit of scratchiness or pressure, but it usually settles quickly without needing anything more than lubricating drops or mild anti-inflammatories.

You won’t need to patch the eye or avoid light. But I do recommend steering clear of swimming, heavy lifting, or rubbing your eyes for the first 24 to 48 hours. It gives the eye time to settle and helps avoid any unwanted irritation. We’ll also likely give you some anti-inflammatory drops to use for a few days.

Most people are driving, working, and back to their regular routines within a day or so. Compared to surgical recovery, it’s minimal fuss with maximum gain.

Risks and Side Effects of SLT

Even though SLT is gentle and non-invasive, no procedure is completely risk-free. Most issues are mild and temporary, but it’s still important to know what to watch for.

• Short-Term Side Effects Are Common but Minor
  Redness, a gritty sensation, or a slight pressure spike can happen after SLT. These usually settle within 24 to 48 hours, often with no need for more than lubricating or anti-inflammatory drops.
• Inflammation and Pressure Changes May Require Monitoring
  Some patients experience a stronger inflammatory response, especially if the eye is already sensitive. In rare cases, pressure can stay elevated and may need further treatment.
• Serious Complications Are Rare
  Compared to surgical options, SLT carries a much lower risk of serious side effects. Because there’s no cutting or burning, future treatment options remain open.

Follow-up is crucial. I always bring patients back shortly after SLT to check their pressure and ensure everything’s settling well.

How SLT Compares to Other Glaucoma Treatments

Which treatment should you trust with your eyesight? That depends on what matters most to you—convenience, effectiveness, or long-term control.

Compared to daily eye drops, SLT often feels like a breath of fresh air. There’s no need to remember your morning and evening dose. No preservatives irritating the eyes. No running out of scripts while on holiday. For many, the laser handles pressure control just as well, without the side effects or hassle.

Then there’s surgery. Procedures like trabeculectomy or drainage devices can be effective but come with longer recovery times and higher risks. SLT sits in the middle: more powerful than drops, but far less involved than surgery.

Older laser options like argon laser trabeculoplasty (ALT) work in similar ways, but they cause more tissue damage and can’t be repeated. SLT, on the other hand, is repeatable and far gentler on the eye.

Feature	SLT Laser Treatment	Eye Drops	Surgical Procedures
Invasiveness	Non-invasive	Non-invasive	Invasive (requires incisions)
Duration of Procedure	10–15 minutes (in-office)	Ongoing daily use	1–2 hours (hospital setting)
Recovery Time	1–2 days	None	1–2 weeks or more
Side Effects	Mild, short-lived	Eye irritation, allergy risk	Higher risk of complications
Repeatable	Yes	Not applicable	Usually not repeatable
Effectiveness	Moderate to high	Varies with adherence	High (but with more risks)
Impact on Daily Routine	Minimal	Requires consistent compliance	Major disruption during recovery
Cost (Long-Term)	One-off or occasional	Ongoing	One-off (but higher upfront cost)

Long-Term Glaucoma Management After SLT

Can one laser session fix glaucoma for good? I wish it were that simple, but glaucoma needs ongoing attention, even after a successful SLT.

After treatment, I keep a close eye on your pressure over the following weeks and months. Most people see a drop within a few days, and it often settles nicely over time. But because glaucoma doesn’t announce itself with symptoms, we rely on regular check-ups to make sure everything’s ticking along as it should.

In some cases, the effect of SLT can wear off after a few years. If that happens, we can repeat the laser or add drops to maintain control.

Frequently Asked Questions About SLT

How Quickly Does It Work?

For most people, pressure starts to drop within a few days and settles fully over the next four to six weeks. It’s not instant, but it’s steady.

How Long Does SLT Last?

That varies. Some people enjoy years of pressure control, while others may need a repeat within a shorter time. On average, results hold for two to five years. If pressure begins to climb again, we can safely repeat the laser.

Will I Still Need Eye Drops?

Possibly. Some patients come off them completely, others cut down. A few still need them, especially if their glaucoma is more advanced. SLT doesn’t replace drops in every case, but it often makes life easier.

Does SLT Improve Vision?

No. SLT helps prevent further damage, but it can’t reverse what’s already lost. Think of it as a pressure valve, not a reset button.

 

Want to learn more about glaucoma? Watch the following interview with Dr. Noor Ali from Eagle Eye Surgeons.

Final Thoughts

SLT laser treatment is a smart, low-fuss option for managing open-angle glaucoma. It helps lower eye pressure, reduces the burden of daily drops, and gives us a reliable way to stay ahead of the disease, sall without the risks of invasive surgery.

If you’re tired of juggling eye drops or worried about long-term pressure control, SLT could make a real difference. It’s safe. It’s quick. And it leaves the door open for future treatments if needed.

We have two convenient locations in Sydney. Our Mosman clinic on the Lower North Shore offers ground floor access, on-site parking, and excellent public transport links. Our Nepean clinic offers two hours of free on-site parking and easy access opposite Nepean Hospital. You can call us on (02) 7228 3900 (MOSMAN) or (02) 7228 3556 (NEPEAN) or arrange an appointment online through this website.