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Study: 5 minutes critical IOP measuring time in supine position

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PHOENIX – According to a poster presentation here at Academy 2012, the critical time point in obtaining IOP values in the supine position was found to be 5 minutes, and measurements obtained several minutes later may produce lower values.

Maximum IOP values, regardless of body position, were observed at 5 minutes in the supine position (P < .001), with the highest IOP reading being about 3 mm Hg higher than baseline seated position (P < .001).

The study, conducted by a team of authors led by Mark H. Sawamura, OD, FAAO, included 23 healthy subjects 18 to 35 years old who were measured for IOP values 5, 10 and 20 minutes of being in the supine position, and then measured again 1 week later, within one hour of the time of the initial visit.

Measurement patterns correlated and matched between weeks.

“Our findings in a healthy population suggest that the peak IOP values are found after 5 minutes in the supine position; however, our study also showed that the IOP decreases at 10 minutes, and then increases at 20 minutes, and in a glaucomatous population, it is speculated that these values may be even greater,” the study authors said.