title: Comparison of intraocular pressure measurements with the digital tonometer TGDc-01 'PRA' and the Goldmann applanation tonometer.
abstract: BACKGROUND
  To compare intraocular pressure (IOP) measurements obtained with the digital tonometer TGDc-01 'PRA' with those from a Goldmann applanation tonometer (GAT).
  
  
  METHODS
  The IOP in 176 eyes of 88 healthy volunteers was measured prospectively in a sitting position. One single measurement, generated by the TGDc-01 PRA, was compared with a single reading from the GAT.
  
  
  RESULTS
  Mean IOP values were 13.0 +/- 3.7 mm Hg for the TGDc-01 PRA (range, 4-22 mm Hg) and 14.9 +/- 3.2 mm Hg for the GAT (range, 8-27 mm Hg). The mean difference was 1.9 mm Hg with a standard deviation of 2.77 mm Hg, and this was statistically significant (p < 0.001, paired t test).
  
  
  CONCLUSIONS
  In comparison to the GAT, the TGDc-01 PRA underestimated IOP on an average of 1.9 mm Hg. Only 50.6% of all measurements were within the +/-2 mm Hg difference range. Thus, the TGDc-01 PRA has no high coincidence degree with the GAT. Both methods were not equivalent.
authors.affiliation: Department of Ophthalmology, Medical School Hannover, Germany. drmichaelmeyer@web.de
authors.forename: Michael W
authors.initials: MW
authors.lastname: Meyer
authors.forename: Roland
authors.initials: R
authors.lastname: Gockeln
authors.forename: Ludwig
authors.initials: L
authors.lastname: Hoy
authors.forename: Andrea
authors.initials: A
authors.lastname: Meyer
authors.forename: Carl
authors.initials: C
authors.lastname: Erb
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001837:Body Weights and Measures; D005260:Female; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D015203:Reproducibility of Results; D014065:Tonometry, Ocular / Q000295:instrumentation / Q000379:methods*