Accurate time interval in repeated tonometry

Acta Ophthalmol Scand. 1998 Oct;76(5):603-5. doi: 10.1034/j.1600-0420.1998.760518.x.


Purpose: Determination of the accurate interval between the measurements in repeated tonometry.

Methods: Two hundred-and-seventy subjects were randomly divided into 6 groups. Two successive intraocular pressure (IOP) measurements were performed with Goldmann-type applanation tonometer at different time intervals in each group. The time intervals between the two measurements were 1, 2, 3, 4, 5 and 10 minutes. The results in each group were statistically analyzed with the significance test for matched observations.

Results: We recorded a statistically significant difference between the first and the second IOP measurements at 1, 3, 4 and 5-minute-intervals. The differences were not significant at 2 and 10 minute-groups.

Conclusion: The time interval between successive IOP measurements should be 2 or 10 minutes for accurate tonometry.

Publication types

  • Clinical Trial
  • Comparative Study
  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Female
  • Humans
  • Intraocular Pressure
  • Male
  • Middle Aged
  • Reference Values
  • Reproducibility of Results
  • Time Factors
  • Tonometry, Ocular* / standards