Laser Trabeculoplasty and Laser Peripheral Iridotomy

Anterior Segment Mode

The intuitive anterior segment mode for Navilas® 577s supports the therapy of laser trabeculoplasty for primary open angle glaucoma, as well as iridotomy and iridoplasty for closed angle glaucoma.

Iridotomy treatment of narrow-angle glaucoma with the Navilas 577s retina laser

Microsecond Pulsing Laser Trabeculoplasty (MLT)

The Navilas® 577s software enables the user to intuitively switch from retina mode to anterior segment mode which also supports laser trabeculoplasty treatments, e.g. with a standard Gonio lens.

MLT treatment example with Navilas® 577s

  • Anterior segment mode 
  • Duty Cycle: 15%
  • Laser power: 1000mW
  • Spot size (single spots): 300μm (real spot size)
  • Pulse duration: 300ms
  • Treatment area (360°) along the Trabecular meshwork



Courtesy of Dr. Dillinger, Germany

Laser Peripheral Iridotomy (LPI)

The Navilas® 577s anterior segment mode also supports Laser Peripheral Iridotomy (LPI) combination therapy with a standard iridotomy ("Abraham") lens with 0.63x laser spot magnification.

LPI combination therapy allows the physician to prepare the iris with the Navilas® 577 nm yellow laser. After the initial treatment with Navilas®, the physician can complete the iridotomy treatment with less complication (bleeding) using a separate YAG laser. This combination therapy is a common procedure.


Courtesy of Dr. Kotaro Tsuboi, Aichi Medical University Hospital, Japan

Clinical Case Iridotomy


Female middle-aged patient presented with narrow angle glaucoma.

Treatment with Navilas® in two stages

  • First stage: Stretch the iris with 4 single spots using 200mW, 200ms and 200µm
  • Second stage: Remove iris stroma using 1000mW, 20ms and 50µm 


The YAG laser was used to complete the treatment. Due to combination therapy, hemorrhages could be prevented.


Courtesy of Dr. Eberlein, University of Augsburg, Germany

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