title: Intraocular pressure measurement in patients with previous LASIK surgery using pressure phosphene tonometer.
abstract: OBJECTIVE
  To compare intraocular pressure (IOP) assessment in post-LASIK patients using non-contact tonometry, pressure phosphene tonometry and applanation tonometry.
  
  
  METHODS
  Sixty-two consecutive LASIK patients were analysed preoperatively and postoperatively with non-contact, pressure phosphene and applanation tonometry. Comparisons among these values were assessed with paired sample Student t-test, Pearson's correlation test and Bland-Altman plotting.
  
  
  RESULTS
  There was no significant difference for preoperative IOP measurement between non-contact, pressure phosphene and applanation tonometry. The mean +/-SD difference between the preoperative non-contact tonometry and postoperative pressure phosphene tonometry IOP measurements was 0.80 +/- 2.77 mmHg (P < 0.01). Postoperative applanation tonometry significantly underestimated IOP measurement by 5.45 +/- 2.96 mmHg (P < 0.001) and postoperative non-contact tonometry significantly underestimated IOP measurement by 9.96 +/- 2.25 mmHg (P < 0.001).
  
  
  CONCLUSIONS
  Pressure phosphene tonometry may provide an alternative method for the assessment of IOP in post-LASIK patients.
authors.affiliation: Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, University Eye Center, Hong Kong Eye Hospital, Hong Kong, China.
authors.forename: Arthur C K
authors.initials: AC
authors.lastname: Cheng
authors.forename: Dexter Y L
authors.initials: DY
authors.lastname: Leung
authors.forename: Eva Y Y
authors.initials: EY
authors.lastname: Cheung
authors.forename: Dorothy S P
authors.initials: DS
authors.lastname: Fan
authors.forename: Ricky W K
authors.initials: RW
authors.lastname: Law
authors.forename: Dennis S C
authors.initials: DS
authors.lastname: Lam
mesh_terms: D000328:Adult; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D020731:Keratomileusis, Laser In Situ; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D010719:Phosphenes; D011184:Postoperative Period; D014065:Tonometry, Ocular / Q000295:instrumentation / Q000379:methods*