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Accurate time interval in repeated tonometry
O F Recep1, H Hasiripi, E Vayisoglu
13rd Eye Clinic, Numune State Hospital, Ankara-Türkiye.
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.