Three-year canaloplasty outcomes for the treatment of open-angle glaucoma: European study results

  • Holger Bull
  • Kurt von WolffEmail author
  • Norbert Körber
  • Manfred Tetz



To report 3-year results investigating the safety and efficacy of canaloplasty, a procedure involving circumferential viscodilation of Schlemm’s canal and tensioning of the inner canal wall to treat open-angle glaucoma.


This was a prospective, multi-center, interventional study of 109 eyes of 109 adult, open-angle glaucoma patients undergoing canaloplasty or combined cataract-canaloplasty surgery. Qualifying preoperative intraocular pressures (IOP) were at least 16 mmHg with historical IOPs of at least 21 mmHg with or without medical therapy. A flexible microcatheter was used to viscodilate the full circumference of the canal and to place a trabecular tensioning suture. Primary outcome measures included IOP, glaucoma medication usage, and adverse events.


Eyes with canaloplasty showed a mean baseline IOP of 23.0 ± 4.3 mmHg and mean glaucoma medication usage of 1.9 ± 0.7 medications, which decreased to a mean IOP of 15.1 ± 3.1 mmHg on 0.9 ± 0.9 medications at 3 years postoperatively. Eyes with combined cataract-canaloplasty surgery showed a mean baseline IOP of 24.3 ± 6.0 mmHg on 1.5 ± 1.2 medications, which decreased to a mean IOP of 13.8 ± 3.2 mmHg on 0.5 ± 0.7 medications at 3 years. Intraocular pressure and medication use results for all study eyes were significantly decreased from baseline (p <0.00001) at all intervals. Late postoperative complications included cataracts (19.1%) and transient IOP elevation (1.8%).


Canaloplasty demonstrated significant and sustained IOP reductions accompanied by an excellent short- and long-term safety profile in adult patients with open-angle glaucoma.


Canaloplasty Microcatheter Non-penetrating glaucoma surgery Open-angle glaucoma Schlemm’s canal 



The authors would like to recognize Dr. Robert Stegmann, Pretoria, South Africa, who was instrumental in the development of canaloplasty.

Financial Support

The sponsor, iScience Interventional Corporation, Menlo Park, California, participated in the design of the study, data monitoring, and data management. The authors have full control of all primary data and agree to allow Graefe’s Clinical and Experimental Ophthalmology to review the data if requested.

Conflict of Interest

Dr. Tetz acknowledges a consulting agreement with iScience Interventional Corporation. Dr. Koerber, Dr. von Wolff, and Dr. Bull have no conflicting interests to disclose.

Supplementary material

417_2011_1728_MOESM1_ESM.doc (32 kb)
Esm 1 (DOC 32 kb)


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Holger Bull
    • 1
  • Kurt von Wolff
    • 1
    Email author
  • Norbert Körber
    • 2
  • Manfred Tetz
    • 3
  1. 1.Augen-Tagesklinik Gross PankowGross PankowGermany
  2. 2.Augencentrum PorzCologneGermany
  3. 3.Eye Center Spreebogen, Berlin Eye Research Institute (BERI)BerlinGermany

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