title: Intraocular pressure variation during femtosecond laser-assisted cataract surgery using a fluid-filled interface.
abstract: OBJECTIVE
  To evaluate intraocular pressure (IOP) during femtosecond laser-assisted cataract surgery using a fluid-filled interface.
  
  
  METHODS
  Ruhr University Eye Clinic, Bochum, Germany.
  
  
  METHODS
  Prospective clinical trial.
  
  
  METHODS
  The absolute IOP was measured with a modified Schiotz tonometer before and after laser-assisted cataract surgery with and without a fluid-filled interface (Liquid Optics interface, Catalys Precision Laser System).
  
  
  RESULTS
  The study evaluated 100 eyes. Tonometry and laser cataract surgery were completed successfully in all eyes. The mean preoperative IOP was 15.6 mm Hg ± 2.5 (SD). Upon application of the suction ring and vacuum, the mean IOP rose to 25.9 ± 5.0 mm Hg and remained nearly constant after the laser procedure (27.6 ± 5.5 mm Hg). After removal of the suction ring, the mean IOP was 19.1 ± 4.4 mm Hg. The IOP 1 hour after surgery was not significantly higher than the preoperative values.
  
  
  CONCLUSIONS
  The results indicate a minor increase in IOP using the fluid-filled interface. This is in strong contrast to substantially higher values reported in the literature with flat and curved applanating contact interfaces.
authors.affiliation: From the Center for Vision Science, Ruhr University Eye Clinic, Bochum, Germany. Electronic address: tim.schultz@kk-bochum.de.
authors.forename: Tim
authors.initials: T
authors.lastname: Schultz
authors.affiliation: From the Center for Vision Science, Ruhr University Eye Clinic, Bochum, Germany.
authors.forename: Ina
authors.initials: I
authors.lastname: Conrad-Hengerer
authors.affiliation: From the Center for Vision Science, Ruhr University Eye Clinic, Bochum, Germany.
authors.forename: Fritz H
authors.initials: FH
authors.lastname: Hengerer
authors.affiliation: From the Center for Vision Science, Ruhr University Eye Clinic, Bochum, Germany.
authors.forename: H Burkhard
authors.initials: HB
authors.lastname: Dick
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002387:Cataract Extraction; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D007429:Intraocular Pressure / Q000502:physiology*; D053685:Laser Therapy / Q000379:methods*; D019654:Lens Implantation, Intraocular; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D041623:Tomography, Optical Coherence; D014065:Tonometry, Ocular