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S. Blanchard, P. Dubois, J. Zemmoury, J.F. Rouland; Clinical Evaluation of Non–Contact Intraocular Pressure Measurement Method by Laser Interferometry . Invest. Ophthalmol. Vis. Sci. 2005;46(13):4843.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To evaluate reproductibility and tolerance of ocular sphere resonance frequencies measurement by laser interferometry. Methods: Prospective and experimental study including 25 healthy subjects. Measurements of ocular sphere resonance frequencies (FRO) by laser interferometry are carried out using a Pérot–Fabry cavity. Prevalent frequencies of ocular resonance have been obtained after an analysis of frequential spectra with Matlab® software. A IOP evaluation by Goldman’s method follow each acquisition of FRO. Reproductibility of FRO measurement is evaluated by the intra–class correlation coefficient (CCI). We have also compared the painfulness of both methods (FRO and IOP). This desagrement survey considering each technique have been carried out using a questionnaire (t test of Student). Results: We obtained 34 procedures of FRO for each subject and 7 measurements of IOP. Frequential spectrum analysis was possible for 85% of the procedures. The reproductibility of FRO measurement was "very good" in 75% of sample (CCI>0.91, p=0,001) and "good" in 25% of collections (0,71>CCI<0.91, p=0.003). Tolerance of FRO measurements with our device is very good for 96% of the patients. Measurements of FRO are definitely better tolerated than traditional tonometry (t=7,48, p<0.001). Conclusions: An reproducible measurement of FRO is now possible using our device. Tolerance is excellent thank to it non–contact aspect. Our new goal is to confirmed, as mentionned in litterature, the relationship between IOP and FRO.
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