J Korean Ophthalmol Soc.  1991 Mar;32(3):295-299.

A Study on the Diurnal Variation of Intraocular Pressure

  • 1Department of Oohthalmology, Yonsei University College of aMedicine, Seoul, Korea.


The diurnal variation of intraocular pressure(IOP) was measured by a Goldmann applanation tonometer in 60 eyes of 30 nromal Korean volunteers, in order to find out the amount of diurnal variation of IOP and the time interval at which the hightst and the lowest IOP were checked. We also checked the diurnal variation of IOP once a week for three weeks to study whether it changes. 1) The mean diurnal variation of IOP was 3.82 +/- 1.83 mmHg, and the diurnal variations of three weeks were 3.87 +/- 1.79 mmHg, 3.78 +/- 1.90 mmHg and 3.78 +/- 1.80 mmHg, respectively. The mean coefficient of variation of diurnal variation was 0.10. 2) In the distribution of high and low points on the diurnal intraocular pressure curve in 60 normal eyes(% of total number of observation), at the optimum IOP 8:00 was the highest(43.9%) and 20:00 was lowest(5.0%); at the lowest IOP 20:00 was the hightest(21.2%) and 8:00 was the lowest(6.7%). There was no time change at which the highest pressure was checked in 55 eyes and at which the lowest pressure was checked in 56 eyes among the 60 eyes.


Coefficient of Variation; Diurnal variation of intraocular pressure(IOP); Goldmann applanation tonometer

MeSH Terms

Intraocular Pressure*
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