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Nicole Stuebiger, Andrea Weiss, Holger Specht, Tobias Hudde; Measurement Of Intraocular Pressure Using The Rebound-Tonometer IOPen In Comparison With Goldmann Applanation Tonometry. Invest. Ophthalmol. Vis. Sci. 2011;52(14):678.
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In clinical practice ophthalmologists often need a tonometer which is independent of a slit lamp. Such a hand-held device is the rebound-tonometer IOPen. We compared the results of the IOPen with Goldmann applanation tonometry.
Measurement of intraocular pressure (IOP) was done in 189 eyes of 95 patients (mean age 66+/-15 years) suffering from ocular hypertension or glaucoma. Both eyes were measured using the IOPen first and the Goldmann applanation tonometer second. Patients were placed in an upright position for all measurements.
Even for well-trained examiners a learning curve of approximately 10 measurements was observed using the IOPen. The IOPen measured an average IOP of 14.4mmHg (OD 14.27+/-3.31mmHg; OS 14.53+/-3.01mmHg) in all 189 eyes. The Goldmann tonometer measured an average IOP 14.3mmHg (OD 13.98+/-2.25mmHg; OS 14.62+/-2.43mmHg). In about 51.6% of all eyes the IOPen achieved IOPvalues which were higher than these in the Goldmann applantion tonometry. The mean IOP difference in mmHg between the two devices was 2.42+/-1.75mmHg in OD and 2.24+/-1.67mmHg in OS. The differences were statistically not significant.
Measurement of IOP with the IOPen is comparable to Goldmann applanation tonometry.
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