Programm                 "Degeneration und Regeneration– Grundlagen, Diagnostik und Therapie"

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Comparison of Intraocular Pressure Measurements with the Digital Tonometer TGDc-01 ”PRA” and Goldmann Applanation Tonometer

Meyer M. W., Schroeder A., Ruefer F., Erb C.
Augenklinik der Medizinischen Hochschule Hannover

Purpose: To compare intraocular pressure (IOP) measurements obtained with the digital portable tonometer TGDc-01 ”PRA”, which measures the IOP through the upper eyelid, with those from Goldmann applanation tonometer in a sitting position.
Method: The IOP in 176 eyes of 88 healthy volunteers was measured prospectively in a sitting position. The measurement, generated by the TGDc-01 ”PRA”, was compared with a single reading from a Goldmann applanation tonometer. Because of the dynamic effect of the TGDc-01 ”PRA” on the eye we used Goldmann tonometer first and the TGDc-01 ”PRA” second to prevent measuring errors. The same instruments were used and the sequence of measurements was not changed.
Results: TGDc-01 “PRA” mean IOP values (13.0 ± 3.7 mmHg; range, 4 to 22 mmHg) underestimated those of Goldmann applanation tonometry (14.9 ± 3.2 mmHg; range, 8 to 27 mmHg). The mean difference was 1.9 mmHg with a standard deviation of 2.8 mmHG and this was statistically significant (P <0.001, paired t test). Fourty-two percent of the measurements were within the ± 1 mmHg difference range, 59.6 % were within ± 2 mmHg and 77.2 % were within ± 3 mmHG. A comparison between the results of the two techniques gave a correlation coefficient of 0.683.
Conclusions: The use of the TGDc-01 “PRA” is simple and it is non-invasive and portable. In comparison to the

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