A comparison of intraocular pressure measurements with the XPERT noncontact tonometer and Goldmann applanation tonometry

J Glaucoma. 1997 Feb;6(1):44-6.


Purpose: The 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.

Methods: An 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.

Results: The 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 > or = 20 mm Hg by Goldmann applanation tonometry, the Sdiff was 3.3 mm Hg.

Conclusions: The XPERT was found to provide reliable intraocular pressure measurements, especially within the normal range.

Publication types

  • Comparative Study

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Equipment Design
  • Female
  • Glaucoma / physiopathology
  • Humans
  • Intraocular Pressure*
  • Male
  • Middle Aged
  • Tonometry, Ocular / instrumentation*