SLT and YAG lasers often sit side by side in the same room, and many practices adding their first anterior-segment laser ask which one to buy first. They are related technologies with different jobs. This guide explains the difference and how to decide.
Two lasers, two jobs
A YAG laser is a Q-switched Nd:YAG laser working at 1064 nm. It is a photodisruptor: it creates a tiny, precisely placed optical breakdown inside the eye. Its everyday uses are posterior capsulotomy after cataract surgery and peripheral iridotomy.
An SLT laser performs selective laser trabeculoplasty, a glaucoma procedure that treats the trabecular meshwork. It uses a frequency-doubled Q-switched Nd:YAG at 532 nm with a large spot and low energy. It is a different instrument with a different delivery system, even though the laser source is related.
Which procedures a particular unit is cleared for is set by its manufacturer's labeling. Check that labeling for the exact model you are considering.
Start from your case mix
If your practice performs cataract surgery, or refers many post-cataract patients back to you, a YAG laser is usually the first purchase. Capsulotomy volume follows cataract volume, and sending those patients elsewhere costs you the follow-up relationship.
If your practice manages a large glaucoma population, an SLT laser lets you offer trabeculoplasty in-house rather than referring it out. Look at how many trabeculoplasty referrals you made last year before deciding.
When a combination platform makes sense
Combination SLT/YAG platforms put both lasers in one slit-lamp delivery system. They save a room and a slit lamp, and they are often the better value when you expect to need both within a few years.
The trade-off is that the whole platform is out of service when either laser is. A practice with high volume on both procedures may prefer two dedicated units so a service visit never stops both. Examples in our catalogue include the Ellex Tango and Tango Reflex and the Lumenis Selecta Duet, alongside dedicated units such as the Ellex Ultra Q YAG and the Ellex Solo and Lumenis Selecta II SLT lasers.
What to check on a pre-owned unit
Both types are durable and well suited to the refurbished market, provided you verify the following:
- Energy output measured against specification at the time of refurbishment, with the report.
- The shot count or usage history the unit records, where available.
- The condition of the slit lamp optics, the aiming beam and the joystick. These are what the surgeon feels every day.
- Which contact lenses, table and footswitch are included.
- The electrical requirements, and the laser safety measures the room will need.
How MP MedPharma can help
Tell us your procedure volumes and your room layout and we will suggest a dedicated unit or a combination platform to match. Every laser we sell ships with its service documentation and warranty coverage, and pricing is quoted per unit.
Next steps
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