SLT and drainage-based MIGS can both lower eye pressure in selected eyes, but they involve different procedures and candidacy decisions. Choosing the next step depends on the pressure your optic nerve needs, the drainage angle, previous treatment, and whether cataract surgery is already appropriate.

A glaucoma evaluation should establish those findings before a procedure is chosen. This article compares SLT with drainage procedures in the MIGS service; medication-delivery implants require their own product-specific discussion.

What are you comparing?

SLT, or selective laser trabeculoplasty, treats natural drainage tissue with a laser through a lens placed against the eye. It is performed without an incision into the eye. The pressure response is assessed afterward and can vary.

Drainage-based MIGS involves surgical access to improve outflow, with or without an implant. MIGS is a category rather than one operation. Ask for the procedure name and explanation of what it changes. A recommendation for one technique does not establish candidacy for every other option.

When might SLT be a reasonable next step?

An appropriate open drainage angle and a pressure goal that the clinician expects SLT could help reach may support laser treatment. Previous response, medication tolerance, and the practical challenge of using daily drops can also matter. Repeat SLT may be considered in some eyes.

Ask when the response will be judged and what happens if it is insufficient. Continue prescribed drops unless your clinician changes them. Laser treatment does not automatically mean medication stops, and ongoing optic-nerve monitoring remains necessary even if pressure improves.

How does cataract timing affect MIGS?

If cataract surgery is already indicated, ask whether an appropriate drainage procedure could be performed at the same operation. Some MIGS devices and techniques have specific indications tied to cataract surgery; other options have different requirements.

The cataract should have its own reason for treatment. A combined plan should explain the expected benefit over cataract surgery alone, additional risks, and likely medication needs afterward. If you do not need cataract surgery, ask which standalone options, if any, fit your diagnosis and anatomy.

When might neither be enough?

An eye with substantial damage, progressing visual fields, or a very low target pressure may need a different approach. The appropriate recommendation can be continued medication, another procedure, or referral for more extensive glaucoma surgery. Selecting the least disruptive option is useful only if it can protect the nerve adequately.

Neither SLT nor MIGS restores nerve tissue already lost. Ask to see the pressure trend, OCT, and visual-field findings that support the proposed next step. A single pressure reading does not describe the whole decision.

What should you settle before committing?

Request a comparison of the expected pressure benefit, recovery, follow-up, risks, and estimated costs for the actual procedures under consideration. Clarify whether the aim is lower pressure, fewer drops, or both, and how success will be measured.

Bring earlier laser records, medication problems, and cataract assessments to a consultation. A useful plan explains why the recommended step fits now and what the next decision would be if it does not reach the target.