title: Comparison of dynamic contour tonometry with Goldmann applanation tonometry in glaucoma practice.
abstract: OBJECTIVE
  To compare intraocular pressure (IOP) readings taken using dynamic contour tonometry (DCT) with IOP readings taken with Goldmann applanation tonometry (GAT) in eyes with glaucoma or ocular hypertension.
  
  
  METHODS
  The present study included 100 eyes in 100 patients with glaucoma or ocular hypertension. After pachymetry DCT and GAT were performed. Intraocular pressures as measured with DCT and GAT were compared with one another and with central corneal thickness (CCT).
  
  
  RESULTS
  Mean DCT IOP measurements (20.1 +/- 4.3 mmHg) were significantly (p < 0.001) higher than GAT IOP values (17.9 +/- 4.7 mmHg). The mean difference between DCT and GAT measurements was 2.1 mmHg (range -3.4 to 9.7 mmHg). The difference followed a normal distribution. Measurements made with DCT and GAT correlated significantly with one another (Spearman's rho = 0.761, p < 0.001). Neither GAT nor DCT measurements showed a significant correlation with CCT (537 +/- 39 microm, range 458-656 microm). Multivariate regression analysis has shown that the difference between DCT and GAT is influenced significantly by ocular pulse amplitude (r = -0.334, p = 0.001) and it is not influenced by CCT (r = -0.106, p = 0.292).
  
  
  CONCLUSIONS
  In eyes with glaucoma or ocular hypertension, DCT facilitates suitable and reliable IOP measurements which are in good concordance with GAT readings. Variation in CCT cannot by itself explain the differences in measurements taken with DCT and GAT in a number of eyes.
authors.affiliation: Ophthalmiatrion Athinon (Athens Eye Hospital), Athens, Greece. ihalkia@otenet.gr
authors.forename: Ioannis
authors.initials: I
authors.lastname: Halkiadakis
authors.forename: Eleni
authors.initials: E
authors.lastname: Patsea
authors.forename: Katerina
authors.initials: K
authors.lastname: Chatzimichali
authors.forename: Sotiris
authors.initials: S
authors.lastname: Skouriotis
authors.forename: Sonia
authors.initials: S
authors.lastname: Chalkidou
authors.forename: Georgios
authors.initials: G
authors.lastname: Amariotakis
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Papakonstadinou
authors.forename: George
authors.initials: G
authors.lastname: Theodossiadis
authors.forename: Apostolos
authors.initials: A
authors.lastname: Amariotakis
authors.forename: Gerasimos
authors.initials: G
authors.lastname: Georgopoulos
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005901:Glaucoma / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000175:diagnosis* / Q000503:physiopathology; D015203:Reproducibility of Results; D014065:Tonometry, Ocular / Q000379:methods* / Q000592:standards