الجلوكوما وضغط العين: هل يمكن أن يكون الليزر SLT علاجًا أوليًا؟

English version

Glaucoma and Eye Pressure: Can SLT Laser Be a First-Line Treatment?

Why is glaucoma dangerous even when vision seems normal?

In common forms of glaucoma, especially open-angle glaucoma, peripheral visual loss can progress slowly enough that the patient notices little in the early stages. Symptoms are therefore a poor screening tool. Diagnosis relies on optic-nerve examination, intraocular pressure, OCT imaging, visual-field testing and other measurements as needed.

High eye pressure is a major risk factor, but it is not the full definition of glaucoma. Some people have ocular hypertension without nerve damage, while others develop glaucomatous damage at pressure readings that appear statistically normal.

The treatment goal: protect the optic nerve by lowering pressure

Current treatment cannot restore retinal ganglion cells and optic-nerve fibers already lost to glaucoma. The practical goal is therefore to slow or stop progression by lowering intraocular pressure to an individualized target.

Options include pressure-lowering drops, selective laser trabeculoplasty and surgical procedures of varying intensity. The choice depends on disease severity, baseline pressure, rate of progression, age, comorbidities and the patient's ability to use long-term therapy consistently.

What is SLT?

Selective laser trabeculoplasty applies laser energy to the trabecular drainage system to improve aqueous outflow and reduce intraocular pressure. It is generally an office-based procedure and is different from laser peripheral iridotomy used for angle-closure mechanisms.

The National Eye Institute notes that trabeculoplasty is used for open-angle glaucoma. Response varies, follow-up remains essential and the pressure-lowering effect can diminish over time.

What changed the "drops first" mindset?

For many years, the conventional pathway was to start drops and consider laser later. The LiGHT trial substantially changed this discussion. Six-year follow-up showed that primary SLT was clinically effective in previously untreated open-angle glaucoma and ocular hypertension.

A 2025 analysis of visual-field progression from the LiGHT cohort found a slower mean rate of visual-field loss in the SLT-first arm than in the drops-first arm, with the clearest difference in mild open-angle glaucoma. This does not make SLT the universal first choice, but it strongly supports discussing it early in suitable patients.

When are drops still important?

Pressure-lowering medications remain effective and essential. Some patients are not suitable for SLT, some still need medication after laser to reach target pressure, and advanced disease may require surgery sooner. The goal is not "laser instead of drops at all costs"; it is durable pressure control with a plan the patient can sustain.

Adherence matters. A highly effective medication cannot protect the nerve if it is not used reliably, and side effects, cost or difficulty administering drops can make laser particularly attractive for some patients.

Bottom line

In 2026, patients should know that SLT is not merely a backup option after eye drops fail. In appropriate open-angle glaucoma or ocular-hypertension cases, it can be an evidence-based first-line strategy. The long-term priority remains the same: protect the optic nerve through regular monitoring and sustained pressure control.

Frequently asked questions

Does high eye pressure always mean glaucoma?

No. Ocular hypertension is a risk state; glaucoma diagnosis depends on optic-nerve damage or risk of progressive damage together with the full clinical assessment.

Does SLT permanently eliminate the need for drops?

Not always. It may reduce or delay medication use in some patients, while others still require drops to reach target pressure.

Is SLT painful?

It is typically performed with topical anesthetic drops and is usually well tolerated. Temporary irritation or pressure changes can occur, so follow-up is important.

Can glaucoma vision loss be reversed?

Established optic-nerve damage is generally irreversible. Early diagnosis and slowing progression are therefore critical.

Medical note: This content is for education and does not replace an examination by an ophthalmologist, particularly for sudden vision loss, severe pain or other urgent symptoms.