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Abstract #25480 Published in IGR 12-1
Intraocular pressure measurements with the newly reconfigured Ocuton S (TT-MV) self-tonometer in comparison to Goldmann applanation tonometry in glaucoma patients
Lanfermann E;
Jurgens C;
Grossjohann R;
Antal S;
Tost FMedical Science Monitor 2009; 15: CR556-CR562
Background: This study compared the new Ocuton S (TT-MV) to the Ocuton S (former configuration) and GAT. The effect of the reconfiguration on measuring accuracy and device handling of glaucoma patients was evaluated. Material/Methods: 101 glaucoma patients performed self-measurements using the old Ocuton S and the Ocuton S (TT-MV). The new Ocuton S (TT-MV) automatically verifies the applanated area. We used GAT as the gold standard reference. Three series of measurements were performed in random order. Results: The mean IOP was 18.3(plus or minus)4.2 mmHg with Ocuton S, 17.5(plus or minus)3.6 mmHg with the reconfigured Ocuton S (TT-MV), and 15.1(plus or minus)3.4 mmHg with GAT. IOP ranged from 9 to 30.5 mmHg with GAT, 7 to 42 mmHg with Ocuton S (TT-MV), and 5 to 38 mmHg with the old Ocuton S. The mean difference between the old Ocuton S and GAT was 3.2(plus or minus)3.5 mmHg, between Ocuton S (TT-MV) and GAT 2.4(plus or minus)3.3 mmHg, and between old and new Ocuton S 0.9(plus or minus)2.9 mmHg (p<0.01). The standard deviation within an individual row of 4 readings per eye with the old Ocuton S averaged 1.9 mmHg, while with the new Ocuton S (TT-MV) the standard deviation averaged 1.7 mmHg. This measuring accuracy showed no age correlation for either self-tonometer (old Ocuton S: coefficient of correlation R=0.2; Ocuton S (TT-MV): coefficient of correlation R=0.053). Conclusions: The newly reconfigured Ocuton S TT-MV improves measuring accuracy significantly and approaches the accuracy achieved using GAT. Improved usability of self-tonometers has clinical relevance, as patients don't have to check the corneal cast on the measuring prism. This could lead to an increased usage of self-tonometry in glaucoma monitoring.
F. Tost. Department of Ophthalmology, Ernst-Moritz-Arndt University, Greifswald, Germany. tost@uni-greifswald.de
Classification:
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)
