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Impressum
Comparison of measurements of the Smart Lens system and the OBF system UK Ltd. according to Langham
1Feucht M., 2Pillunat L. E., 1Bernd A. S., 2Müller M. F., 2Köller A. U.
1University Eye Hospital Hamburg Eppendorf, Martinistr. 52, Hamburg, 2University Eye Hospital Dresden, Fetscherstr. 74, Dresden
Objective: Evaluation of ocular pulse amplitude is an important
parameter for the quantification of ocular perfusion. The OBF system according
to Langham has been established in glaucoma diagnostics. The recently
introduced Smart Lens also allows pulse amplitude estimation. Aim of the
present study was to compare the measurements of both methods.
Methods: Ocular pulse amplitudes and intraocular pressure were
measured with a pneumotonometric system (OBF system UK) and a contact
lens tonometer (Smart Lens system). 38 subjects (9 male, 29 female) were
included, consisting of 10 healthy persons and 28 glaucoma patients. One
eye was randomly chosen. Intraocular pressure was measured before and
after Smart Lens pulse amplitude evaluation. For statistical analysis
Wilcoxon test, Man Whitney U test and correlation analysis were applied.
Results: During Smart Lens application the intraocular pressure
decreased significantly by 2.8mmHg (p<0.01), caused by the tonographic
effect. The mean pulse amplitude was 2.63 mmHg+-0.94mmHg measured by the
OBF system and 2.69mmHg+-1.17mmHg measured by the Smart Lens system. Both
results are comparable (p=0.82). The correlation coefficient, however,
was only r=0.5.
Conclusion: The ocular pulse amplitudes, representing choroidal
hemodynamics, are evaluable by both methods. The measurements indicate
that the results obtained by the mew contact lens technique do not correlate
well with those obtained by the OBF system. This might be due to the individual
scattering of both techniques, i.e. each measurement seems not to be correlated
well with the corresponding measurement using the alternative technique.