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SLT laser | Glaucoma treatment

The SLT laser , or Selective Laser Trabeculoplasty, is a treatment aimed mainly at the trabecular meshwork in the management of glaucoma andocular hypertension. Its objective is to lower intraocular pressure by improving the natural drainage of the eye’s fluid,aqueous humor, without an incision and on an outpatient basis. At Les Oliviers Eye Clinic in Sousse, Tunisia, SLT is proposed when it can help stabilize pressure, reduce the number of eye drops, or complement treatment already in place, while maintaining regular follow-up.

Purpose Lower intraocular pressure
Principle Stimulate natural drainage
Key point Outpatient treatment with a post-treatment check

Who is SLT suitable for?

SLT is generally proposed for certain forms of glaucoma, often open-angle glaucoma, or elevated intraocular pressure when a lower target pressure is required. It may be used as a first option, as an alternative to drops, or as an additional treatment if pressure is not sufficiently controlled.

  • Open-angle glaucoma: An option to lower pressure and stabilize the disease.
  • Ocular hypertension: Reduce pressure to lower the risk of progression.
  • Reduce the number of eye drops: When the aim is to limit the number of drops or their side effects.
  • Additional treatment: If pressure remains too high despite drops.
SLT does not “cure” glaucoma. It helps control pressure in order to protect the optic nerve. Follow-up with pressure checks, visual field testing, and OCT remains essential.

How does SLT work?

Intraocular fluid drains mainly through an area called the trabecular meshwork. In glaucoma, this drainage may become less effective. SLT delivers highly targeted pulses to the trabecular meshwork. The aim is not to “burn” tissue, but to stimulate a biological response that improves drainage of the aqueous humor and therefore lowers pressure.

  • Target area: The trabecular meshwork, the eye’s drainage system.
  • Action: Improves fluid outflow, resulting in lower pressure.
  • Timing: The effect is not always immediate and develops progressively.
SLT laser treatment for glaucoma in Sousse, Tunisia

How the session is performed

SLT is performed during an outpatient visit without general anesthesia. Anesthetic drops are placed in the eye and a special contact lens is used to guide treatment. You will see flashes of light and may feel mild discomfort. The session generally lasts a few minutes per eye. Pressure is then checked immediately or shortly afterwards according to the protocol.

  • Before: Pressure measurement, examination of the drainage angle, and preparatory drops.
  • During: Flashes, mild sensation, and treatment around the trabecular meshwork.
  • Afterwards: Pressure check and follow-up instructions.
  • Eye drops: Sometimes anti-inflammatory drops for a few days, depending on the indication.
Is it painful?

Most patients report mild to moderate discomfort, including pressure from the contact lens and bright flashes. Significant pain is rare.

Expected results and follow-up

The aim is to reduce pressure sufficiently to protect the optic nerve. Effectiveness varies from one patient to another. Some patients can reduce their drops, while others need to continue additional treatment. The doctor agrees a target pressure with you and monitors progression through check-ups and tests such as visual field testing and OCT.

  • Objective: Reach a target pressure suited to your optic nerve.
  • Progress: The effect develops gradually, with check-ups to measure the response.
  • Additional treatment: Drops or another procedure if pressure remains high.
A good result is assessed over time. The most important outcome is stability of the optic nerve and visual field.

After SLT: practical advice

Recovery is generally straightforward. You may notice mild irritation, light sensitivity, or temporary blurred vision. Use prescribed drops and attend the follow-up appointment.

  • Resume your day: Often possible quickly, depending on your comfort.
  • Avoid rubbing the eye: Especially on the day of treatment.
  • Use prescribed eye drops: Usually for only a few days, when prescribed.
  • Seek emergency care if you experience: intense pain, sudden loss of vision, or redness.

Frequently asked questions

Is the effect of SLT permanent?

The effect may last several years but can decrease over time. Depending on the case, another session may be reconsidered or treatment adjusted.

Should I stop my drops before SLT?

This depends on your situation. The doctor will clearly tell you what to continue or change. Do not alter treatment without instructions.