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Linner E. 1, Olsson T. 2
1 Department of Ophthalmology, Göteborg University, Göteborg, Sweden
2 Department of Signals and Systems, Chalmers University of Technology Göteborg, Sweden
Based on Schiötz tonometer from 1905, Grant reported the clinical method of tonography in 1950. Different attempts were then made to limit the errors and improve the accuracy. About 25 years ago, a new instrument for constant pressure tonography was developed. The clinical significance was that the intraocular pressure, the pulse amplitude, the applanating force and the applanated area could be measured simultaneously and independently in living human eyes. Some further improvements were, however, needed.