title: Comparative evaluation of Diaton and Goldmann applanation tonometers.
abstract: OBJECTIVE
  To evaluate the agreement between intra-ocular pressure (IOP) measurements with the Diaton and the Goldmann applanation tonometers (GAT).
  
  
  METHODS
  In this cross-sectional observational study, a total of 196 eyes of 196 participants (66 patients with glaucoma, 130 healthy subjects) were included. IOP measurements were obtained from all patients using the Diaton and GAT.
  
  
  RESULTS
  The average age of the patients enrolled in this study was 48.3 ± 14.6 years (range 18-79). The overall mean IOP measured by the Diaton was 17.2 ± 6.4 mm Hg, while that in glaucoma patients was 17.9 ± 6.2 mm Hg and in the control group 15.8 ± 4.9 mm Hg. Pearson's correlation coefficient showed a moderate correlation in IOP measurements by the two instruments in healthy controls (r = 0.460, p < 0.01); however, the same correlation for the glaucomatous subjects was noted to be poor (r = 0.261, p = 0.57). The limits of agreement (95% confidence intervals) ranged from -9.9 to +11.2 and from -15.3 to +19.7 mm Hg in healthy controls and glaucoma patients, respectively.
  
  
  CONCLUSIONS
  The Diaton measurements do not correlate well with those provided by applanation tonometry. The two tonometers show very wide limits of agreement so they may not be used interchangeably in clinical practice for the measurement of IOP.
authors.affiliation: Vision Eye Institute, Sydney, Australia.
authors.forename: Shveta Jindal
authors.initials: SJ
authors.lastname: Bali
authors.forename: Shibal
authors.initials: S
authors.lastname: Bhartiya
authors.forename: Amit
authors.initials: A
authors.lastname: Sobti
authors.forename: Tanuj
authors.initials: T
authors.lastname: Dada
authors.forename: Anita
authors.initials: A
authors.lastname: Panda
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D005902:Glaucoma, Open-Angle / Q000175:diagnosis*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D014065:Tonometry, Ocular / Q000295:instrumentation* / Q000592:standards; D055815:Young Adult