CAFFEINE, WATER DRINKING TEST, AND GLAUCOMA

According to this study in Clinical and Experimental Ophthalmology

The maximum intraocular pressure from the water drinking test was greater than the caffeine test and showed greater fluctuation in IOP (4.3 ± 2.7 mmHg [27.7%] p<0 .0001="" 1.9="" caffeine="" compared="" mmhg="" p="0.004).</p" test="" the="" to="">

The mean rise in IOP was greater with WDT than the CT. Intake of a 104mg caffeinated beverage does not appear to provide an alternative for patients unable to tolerate the WDT.