ABSTRACTThe 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.
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