title: Reproducibility of intraocular pressure and outflow facility measured by pneumatic tonography and Schiotz tonography.
abstract: The purpose of this study was to compare means, variability, and reproducibility in intraocular pressure and in outflow facility measured repeatedly over several days by Bio-Rad pneumatonography and Schiotz tonography in normal human volunteers. For each instrument a measurement of intraocular pressure and one of outflow facility were obtained at each of three repeated examinations of eight healthy subjects in the supine position. For pressure, the Bio-Rad mean was significantly higher by 5.31 mmHg than the Schiotz mean (p < 0.00005). Reproducibility was 71.1% and 59.0% for the Bio-Rad and Schiotz, respectively. For outflow, the Bio-Rad and Schiotz means were not significantly different. Reproducibility was 17.3% and 58.7% for the Bio-Rad and Schiotz, respectively. For measuring pressure, both the Bio-Rad and Schiotz instruments had good reproducibility; for measuring outflow, the Bio-Rad and Schiotz instruments had low and good reproducibility, respectively.
authors.affiliation: Department of Statistics, California Polytechnic State University, San Luis Obispo, USA.
authors.forename: N C
authors.initials: NC
authors.lastname: Wheeler
authors.forename: D A
authors.initials: DA
authors.lastname: Lee
authors.forename: Q
authors.initials: Q
authors.lastname: Cheng
authors.forename: W F
authors.initials: WF
authors.lastname: Ross
authors.forename: L
authors.initials: L
authors.lastname: Hadjiaghai
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D014065:Tonometry, Ocular / Q000379:methods*