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EM Hoffmann, FH Grus, O Schwenn, N Pfeiffer; Intraocular Pressure (IOP) and Ocular Pulse Amplitude (OPA) using Ocular Dynamic Tonometry (ODT) . Invest. Ophthalmol. Vis. Sci. 2002;43(13):1081.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose:The new Ocular Dynamic Tonometer (ODT, investigational device supplied by ODC Ophthalmic Development Company AG, Switzerland) allows simultaneous recording of IOP and ocular pulse amplitude (OPA). It was the aim of this study to compare the IOP results of this new device with Goldmann tonometry. Furthermore, IOP and OPA measured with the new slitlamp-mounted Ocular Dynamic Tonometer were compared to the hand-held SmartLens , the previously introduced gonioscopic contact lens tonometer (ODC Ophthalmic Development Company AG, Switzerland). Methods:20 healthy subjects were included in this study. IOP was determined three times each consecutively using ODT, SmartLens®, and Goldmann tonometry. Furthermore, OPA was measured three times consecutively by ODT and SmartLens®. Results:No difference (P≷0.05) was found between the IOP values by means of ODT (mean: 16.6 mmHg, median: 15.33 mmHg, SD:+/-4.04mmHg) and Goldmann tonometry (mean: 16.17 mmHg, median: 15.33 mm Hg, SD:+/-4.03mmHg). The IOP values of SmartLens® (mean: 20.25 mmHg, median: 19 mmHg, SD:+/-4.96mmHg) were significantly different (P<0.05) both from Goldmann tonometry and from ODT. The OPA values of the ODT (mean: 3.08mmHg, SD:+/-0.92mmHg) were significantly lower (P<0.05) than those obtained by SmartLens® (mean: 3.92mmHg, SD:+/-0.83mmHg). Conclusion:The ODT is a new, reliable device for the measurement of IOP in comparison to Goldmann tonometry. The new design of this slitlamp-mounted device, which is operated similar to the Goldmann tonometer, has led to important accuracy enhancements and increased ease-of-use. SmartLens is used similar to a typical gonioscopic contact lens and gives significantly different results, probably mostly due to the fact that it is hand-held. Thus, the new device promises to perform digital IOP measurements comparable to Goldmann tonometry. Additionally, the ODT device furnishes a measurement of OPA, which could be helpful e.g., for the detection of glaucoma.
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