In this episode of the Interventional Glaucoma Podcast, Prof. Gus Gazzard is joined by Prof. Cédric Schweitzer and Dr. Marc Töteberg-Harms to explore what the data tell us about interventional glaucoma. They discuss the robustness of Elios peer-reviewed evidence on efficacy, safety, and long-term outcomes, the crucial role of high-quality data in guiding everyday clinical decisions, and the continued commitment to ongoing research and future data collection in glaucoma care.
The Interventional Glaucoma Podcast
Episode 19: ELIOS – What does the data tell us?
- 16 December 2025
Key Takeaways
Robust Long-Term Data:
- Eight-year follow-up studies on ELIOS show sustained intraocular pressure (IOP) reduction (≈25–30%) and decreased medication use with a strong safety profile.
- These are among the longest follow-up results available for any MIGS procedure, confirming durable outcomes for both primary and pseudoexfoliative open-angle glaucoma.
Consistency Across Studies:
- Multiple independent centers (e.g., Zurich, Hamburg, Berlin) report similar efficacy and safety findings, reinforcing the reliability of ELIOS data.
- Combination with cataract surgery (phaco+ELIOS) tends to provide greater IOP and medication reduction than standalone ELIOS.
Safety and Surgical Advantages:
- The excimer laser’s non-thermal mechanism avoids tissue scarring, offering a gentle, implant-free approach that preserves the conjunctiva for potential future filtering surgery.
- Complication rates are minimal and comparable to standard cataract surgery.
Clinical and Patient Impact:
- Long-term data provide confidence for clinicians and reassurance for patients who seek sustainable glaucoma control.
- ELIOS is particularly suitable for mild-to-moderate glaucoma, effectively reducing medication burden while maintaining safety.
Future Direction:
- Continued data collection, randomized controlled trials, and real-world evidence will further strengthen the understanding of ELIOS efficacy and its role in glaucoma management.
- Ongoing research underscores the importance of robust peer-reviewed evidence in shaping clinical decisions and supporting adoption of interventional glaucoma approaches.
Guests

Prof. Gus Gazzard
Professor Gus Gazzard is Director of Surgery at Moorfields Eye Hospital and Professor in Ophthalmology, Glaucoma Studies at UCL London. He has joined the Glaucoma Research Society as one of the top 100 glaucoma researchers in the field and is leading author of multiple publications on MIGS surgery. He was voted in the World’s Top 10 Most Influential Ophthalmologists for several years.

Prof. Cedric Schweitzer
Professor Cedric Schweitzer is a university professor and hospital practitioner in ophthalmology at Bordeaux University Hospital, and a researcher at INSERM U1219 (University of Bordeaux), focusing on epidemiology and age-related eye diseases. His expertise includes medical and surgical glaucoma, adult cataract surgery, and intraocular implant biomaterials.
He trained at Moorfields Eye Hospital (London) and has led and published numerous clinical studies, including in The Lancet, and received awards from the French Ophthalmology Society (2011) and the French Glaucoma Society (2013).

Dr. Marc Toeteberg-Harms
Dr. Toeteberg-Harms relocated in 2024 to Iowa City, IA and is on the faculty of the Carver College of Medicine at the University of Iowa. Prior, he was Associate Professor for the Department of Ophthalmology at the Medical College of Georgia in Augusta, GA. Prior to his faculty position at the Medical College of Georgia, Dr. Toeteberg served as Director of Glaucoma Service and Director of Inpatient Ophthalmology for the University Hospital Zurich, in Switzerland. After completing his residency training in Germany and Switzerland, Dr. Toeteberg completed a clinical and basic research fellowship at the Massachusetts Eye and Ear Infirmary in Boston, MA and at Case Western Reserve Univeristy in Cleveland, OH.
Additional Resources
Follow Prof Gus Gazzard on Social:
Professor Gus Gazzard | LinkedIn
Follow Prof Cedric Schweitzer on Social:
Professor Cedric Schweitzer | Linkedin
Follow Dr Marc Toeteberg-Harms on Social:
Dr Marc Toeteberg-Harms | Linkedin
Episode 18: Health Economics in Interventional Glaucoma
In this episode, Prof. Gus Gazzard talks with Dr. Marc Töteberg-Harms and Dr. Timothy Hamann about the cost-effectiveness and ethical importance of MIGS in interventional glaucoma.
Episode 17: Excimer fundamentals
In this episode, Prof. Gus Gazzard joins Dr. Neeru Vallabh and Mr. Dirk Mühlhoff to explore how excimer laser technology is reshaping glaucoma care through precise, non-thermal trabecular treatments.
Episode 16: Integrating Glaucoma Surgery into Your Phaco Routine
In this episode, Prof. Verena Prokosch and Ms. Nishani Amerasinghe explore integrating MIGS with cataract surgery, highlighting how laser trabecular procedures enhance outcomes when combined with phacoemulsification.