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Abstract
A nonlinear viscoelastic model of the human eye was fitted by the method of least squares to a set of 4, 18, and 20 minute long tonograms. Random and systematic deviations of the fitted model from the actual data points throughout the entire tracing were studied. This method of tonographic analysis (viscoelastic method) was compared to both the conventional method of analysis (fitting the elastic model only to the first and last points of the tonogram) and to a statistical method (fitting the elastic model to the entire tonogram by the method of least squares). Random and systematic deviations of the statistical and viscoelastic methods were strikingly better than the conventional method. The viscoelastic method was somewhat better than the statistical method.