Services / Ophthalmological procedures / Selective Laser Trabeculoplasty (SLT )

Selective Laser Trabeculoplasty (SLT )



Selective Laser Trabeculoplasty (SLT) is a gentle, minimally invasive laser procedure that lowers intraocular pressure in patients with open-angle glaucoma.

The procedure involves stimulation and selective photodamage of retinal pigment epithelium in the trabecular meshwork. The goal of the procedure is to facilitate outflow of the aqueous humor and lower intraocular pressure.

SLT is a quick, painless and, most importantly, extremely safe glaucoma procedure. It is often an effective solution for patients with open angle glaucoma.

SLT uses selective photothermolysis, meaning that the laser targets selected cells in the trabecular meshwork, while other tissues are not affected. The goal of the procedure is to stimulate the body’s natural healing mechanisms and cause remodeling of the trabeculation, which is the natural sieve in the eyeball.

Ultimately, we achieve greater trabecular patency and improve the outflow of aqueous humor from the eye, and consequently the intraocular pressure is permanently reduced.

The SLT method was developed as an alternative to the ALT procedure.

ALT, the classic Argon Laser Trabeculoplasty, involves photodamaging cells by performing multiple laser burns in the trabecular meshwork, which facilitates the outflow of aqueous humor from the eye and ultimately lowers intraocular pressure.

Laser for PSLT at Retina

At Retina, we perform an improved version of selective laser trabeculoplasty called PSLT, for which we use a Pattern Scan Laser with innovative and advanced PASCAL technology. This technology ensures a high level of precision and safety. The system allows much more accurate and faster beam, which results in better therapeutic effect than the lasers most commonly used in ophthalmology for photocoagulation of the anterior segment of the eye.

In patients with:

  • primary open-angle glaucoma,
  • intraocular hypertension,
  • pigmentary glaucoma,
  • intolerance of drops that lower intraocular pressure

we perform PSLT, which is photocoagulation with a pre-set pattern of laser spots which are precisely adjacent to each other (multiple foci of laser coagulation, contrary to single foci used in other methods).

Thanks to our state-of-the-art laser, the procedure is non-invasive, quick and causes no discomfort to the patient.

A pattern to suit every need. A wide range of patterns provides many variations so as to meet almost any clinical need.


SLT procedure takes about 5 minutes.

  • Before the procedure, the patient’s visual acuity is tested and the intraocular pressure is measured.
  • Pupil-dilating drops are administered.
  • The doctor treats various parts of trabecular meshwork with a laser beam.

This results in improved outflow of aqueous humor from the eye, and thus reduces  intraocular pressure.

  • The patient must sit still during the procedure.
  • After the procedure, we perform a control measurement of intraocular pressure.
  • SLT treatment may cause temporary discomfort in vision.
  • After the procedure, the patient might be prescribed drops.

Important! After the procedure the patient must not drive.

 SLT procedure should be repeated, as its effectiveness diminishes over time.

 Kalkulator MediRaty