A Comparison of Intraocular Pressure Measurements with the XPERT Noncontact Tonometer and Goldmann Applanation Tonometry

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SummaryPurposeThe purpose of this study was to compare intraocular pressure measurements obtained with XPERT, an upgraded model of the noncontact tonometer, with those from Goldmann applanation tonometry.MethodsAn average of three intraocular pressure measurements, generated by the XPERT, was compared with a single reading from a Goldmann applanation tonometer in 421 eyes of 220 patients.ResultsThe standard deviation of the matched-pair differences (Sdiff) for the entire population was 2.3 mm Hg, whereas in a subset of 95 eyes with intraocular pressures of 3 ≥20 mm Hg by Goldmann applanation tonometry, the Sdiff was 3.3 mm Hg.ConclusionsThe XPERT was found to provide reliable intraocular pressure measurements, especially within the normal range.Intraocular pressure

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