title: Visualization of aqueous shunt position and patency using anterior segment optical coherence tomography.
abstract: OBJECTIVE
  To describe the use of anterior segment optical coherence tomography (AS-OCT) to clarify the position and patency of aqueous shunt devices in the anterior chamber of eyes where corneal edema or tube position does not permit a satisfactory view.
  
  
  METHODS
  Noncomparative observational case series.
  
  
  METHODS
  Four cases are reported in which aqueous shunt malposition or obstruction was suspected but the shunt could not be seen on clinical examination. The patients underwent AS-OCT to identify the position and patency of the shunt tip.
  
  
  RESULTS
  In each case, AS-OCT provided data regarding tube position and/or patency that could not be obtained by slit-lamp examination or by gonioscopy that influenced management.
  
  
  CONCLUSIONS
  AS-OCT can be used to visualize anterior chamber tubes in the presence of corneal edema that precludes an adequate view or in cases where the tube is retracted into the cornea. In such cases, AS-OCT is useful in identifying shunt patency and position, which helps guide clinical decision making.
authors.affiliation: Glaucoma Service, Moorfields Eye Hospital, London, United Kingdom.
authors.forename: Usman
authors.initials: U
authors.lastname: Sarodia
authors.forename: Eamon
authors.initials: E
authors.lastname: Sharkawi
authors.forename: Scott
authors.initials: S
authors.lastname: Hau
authors.forename: Keith
authors.initials: K
authors.lastname: Barton
mesh_terms: D000293:Adolescent; D000368:Aged; D000867:Anterior Chamber / Q000473:pathology*; D003941:Diagnostic Techniques, Ophthalmological; D005129:Eye Foreign Bodies / Q000175:diagnosis*; D005260:Female; D005901:Glaucoma / Q000601:surgery; D020327:Glaucoma Drainage Implants; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D041623:Tomography, Optical Coherence / Q000379:methods*