title: Comparison of Goldmann applanation and dynamic contour tonometry in a population of Mexican open-angle glaucoma patients.
abstract: To compare intraocular pressure (IOP) measurements obtained with Goldmann applanation (GAT) and dynamic contour tonometry (DCT) in a Mexican population. 40 glaucoma patients were included in this cross-sectional observational cohort study. IOP measurements were performed in the following order: DCT, ultrasonic pachymetry and GAT, with a 5-minute difference between each measurement, between 8 am and 2 pm. Only DCT measurements of good quality (Q ≤ 3) were accepted. GAT measurements were made three times with the same Goldmann tonometer, previously checked for calibration errors, and the mean was used for statistical purposes. The IOP (mean [standard deviation], 95 % confidence interval [CI]) measured with the Goldmann tonometer (13.2 [2.4], 12.4-14.0 mmHg) was significantly lower than that obtained with the DCT (18.4 [3.3], 17.0-19.2 mmHg), p < 0.0001. Pearson's correlation coefficients between CCT and IOP measured with GAT and DCT were (r = 0.24, 95 % CI = 0.07-0.52, p = 0.133) and (r = 0.13, 95 % CI = -0.19 to 0.43, p = 0.412), respectively. The concordance correlation coefficient between GAT and DCT was r c = 0.3, 95 % CI = 0.17-0.41). DCT seems to overestimate the IOP as compared to GAT. Additionally, although there was a good correlation between the IOP measurements assessed with either GAT or DCT, the agreement was poor.
authors.affiliation: Association for Preventing Blindness in Mexico (Dr. Luis Sanchez Bulnes Hospital), Mexico City, Mexico. jimenez_roman@yahoo.com
authors.forename: J
authors.initials: J
authors.lastname: Jimenez-Roman
authors.forename: F
authors.initials: F
authors.lastname: Gil-Carrasco
authors.forename: A
authors.initials: A
authors.lastname: Martinez
authors.forename: O
authors.initials: O
authors.lastname: Albis-Donado
authors.forename: J D
authors.initials: JD
authors.lastname: De la Torre-Tovar
mesh_terms: D000368:Aged; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D005260:Female; D005902:Glaucoma, Open-Angle / Q000503:physiopathology*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008800:Mexico; D008875:Middle Aged; D014065:Tonometry, Ocular / Q000379:methods*