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New test for peak IOP is faster, easier, researcher says

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FORT LAUDERDALE, Fla. — A 5-minute provocative test that inverts a patient's body 30° is as good as a standard water drinking test in detecting peak IOP in glaucoma patients, according to a poster presented here.

"The test is easier, faster and more comfortable for patients," Fabio N. Kanadani, MD, said at the Association for Research in Vision and Ophthalmology meeting. "It is based on yoga practices."

Researchers tested 18 "normal" eyes, 30 glaucoma suspect eyes and 31 with early glaucoma. During the test, they had the patient lie in a 30° supine position with his or her head pointed downward. IOP measurements were taken with a Perkins applanation tonometer after 5 minutes.

Researchers also had the patients take the normal water drinking test. During that test, patients fasted before drinking 1 liter of water in 5 minutes. Four measurements were performed with standard achromatic perimetry at basal, 15 minutes, 30 minutes and 45 minutes.

"Our results show that there was a statistical difference in both test groups between the basal IOP and the peak IOP," Dr. Kanadani said. "The inverted test is just as good as the water test in detecting peak IOP, and it doesn't take an overnight stay in the hospital to perform."