title: An investigation of CO2 laser scleral buckling using moiré interferometry.
abstract: OBJECTIVE
  To demonstrate suitability of moiré interferometry to assess and quantify laser-induced shrinkage of scleral collagen for buckling procedures.
  
  
  METHODS
  Scleral buckling of human cadaver eyes was investigated using a Coherent Ultrapulse CO2 laser. Projection moiré interferometry was employed to determine the out-of plane displacement produced by laser exposure, and in-situ optical microscopy of reference markers on the eye was used to measure in-plane shrinkage.
  
  
  RESULTS
  Measurements based on moiré interferometry allow a three dimensional view of shape changes in the eye surface as laser treatment proceeds. Out-of-plane displacement reaches up to 1.5 mm with a single laser spot exposure. In-plane shrinkage reached a maximum of around 30%, which is similar to that reported by Sasoh et al (Ophthalmic Surg Lasers. 1998;29:410) for a Tm:YAG laser.
  
  
  CONCLUSIONS
  The moiré technique is found to be suitable for quantifying the effects of CO2 laser scleral shrinkage and buckling. This can be further developed to provide a standardized method for experimental investigations of other laser sources for scleral shrinkage.
authors.affiliation: Department of Physics, University of Hull, United Kingdom.
authors.forename: Saher M
authors.initials: SM
authors.lastname: Maswadi
authors.forename: Peter E
authors.initials: PE
authors.lastname: Dyer
authors.forename: Dinesh
authors.initials: D
authors.lastname: Verma
authors.forename: Wadah
authors.initials: W
authors.lastname: Jalabi
authors.forename: Dinesh
authors.initials: D
authors.lastname: Dave
mesh_terms: D002102:Cadaver; D002245:Carbon Dioxide; D004867:Equipment Design; D006801:Humans; D021621:Imaging, Three-Dimensional; D007368:Interferometry / Q000295:instrumentation / Q000379:methods*; D053685:Laser Therapy / Q000295:instrumentation; D015903:Moire Topography / Q000295:instrumentation; D012590:Sclera / Q000473:pathology; D012591:Scleral Buckling / Q000295:instrumentation
chemical_list: D002245:Carbon Dioxide