Evaluation of the tightness of contact between limbal sclera tunnel and tube following ahmed glaucoma valve implantation

Gábor Holló, Farzaneh Naghizadeh

Research output: Contribution to journalArticle

1 Citation (Scopus)


To investigate whether the tightness of contact between the tube and the limbal sclera tunnel can be evaluated with high-magnification anterior segment optical coherence tomography (OCT) imaging following Ahmed glaucoma valve implantation. Methods: Tightness between the tube and the limbal sclera tunnel was investigated with the CAM-L cornea lens adapter of the Optovue Fourier-domain OCT (RTVue-OCT) for 21 uncomplicated Ahmed glaucoma valves implanted in 20 eyes of 19 patients with glaucoma. Nineteen valves were implanted to 124 months earlier (late postoperative cases) and 2 valves 1 day prior to the imaging (early postoperative cases). All valves were introduced into the anterior chamber via a limbal sclera tunnel. Results:The limbal intratunnel part of the tube was successfully imaged in all but 2 cases where an additional full-thickness sclera patch was used. In 14 cases, the contact was tight without tube compression. In cases, the tube was partially compressed but remained open in the limbal sclera tunnel, and redi-lated behind the limbus. No case with loose contact or peritubular filtration was seen. The posterior run of the tube was successfully imaged in all 19 cases without a full-thickness sclera patch. Conclusions: High-magnification imaging with the CAM- L anterior segment adapter of the RTVue-OCT allows detailed examination of the limbal insertion area of tubes in both the early and late postoperative periods. Therefore this method may potentially be applied for detection of complications related to tube insertion after glaucoma drainage device surgery.

Original languageEnglish
Pages (from-to)905-908
Number of pages4
JournalEuropean Journal of Ophthalmology
Issue number6
Publication statusPublished - May 27 2013



  • Ahmed glaucoma valve
  • Fourier-domain optical coherence tomography
  • Glaucoma drainage device
  • RTVue-100 optical coherence tomograph
  • Tube insertion

ASJC Scopus subject areas

  • Ophthalmology

Cite this